Here are some of the in-demand skills in digital marketing that can lead to a successful and lucrative career, along with data:

1. Data Analytics: With the rise of big data, the ability to analyze and interpret data is a highly valued skill in digital marketing. According to Glassdoor, the national average salary for a Digital Marketing Analyst is $70,000 per year.
2. Search Engine Optimization (SEO): SEO is the practice of improving a website’s visibility on search engines. According to Glassdoor, the national average salary for an SEO specialist is $64,000 per year.
3. Content Marketing: Content marketing involves creating and sharing valuable content to attract and retain customers. According to Glassdoor, the national average salary for a Content Marketing Manager is $80,000 per year.
4. Social Media Marketing: Social media marketing involves using social media platforms to promote a brand or product. According to Glassdoor, the national average salary for a Social Media Manager is $56,000 per year.
5. Email Marketing: Email marketing involves sending promotional emails to a targeted audience. According to Glassdoor, the national average salary for an Email Marketing Manager is $77,000 per year.
6. Digital Advertising: Digital advertising involves creating and managing online advertising campaigns. According to Glassdoor, the national average salary for a Digital Advertising Manager is $75,000 per year.

Overall, there are many in-demand skills in digital marketing that can lead to a successful and lucrative career. By developing expertise in these areas and staying up-to-date on the latest industry trends, digital marketers can build highly successful careers and earn high salaries.

Here are some ways to grow your digital marketing career with examples:

1. Stay Up-to-Date on Industry Trends: To be successful in digital marketing, it’s important to stay up-to-date on the latest trends and best practices. Attend industry conferences and events, read industry blogs and publications, and network with other professionals in the field.
2. Build a Strong Online Presence: As a digital marketer, it’s important to have a strong online presence. Create and maintain a professional website, blog, and social media accounts to showcase your skills and experience.
3. Develop a Specialization: Many successful digital marketers specialize in a specific area, such as SEO, content marketing, or social media marketing. By developing a specialization, you can become an expert in your field and stand out from other candidates when applying for jobs.
4. Get Certified: There are many certifications available in digital marketing, such as Google Analytics, HubSpot Inbound Marketing, and Hootsuite Social Media Marketing. These certifications can demonstrate your expertise and help you stand out to potential employers.
5. Seek Mentorship and Training: Seek out mentorship and training opportunities to continue developing your skills and expertise. Many companies offer professional development opportunities, such as workshops and training programs, to help their employees grow and succeed in their careers.

For example, let’s say you are a digital marketer specializing in social media marketing. You could attend social media marketing conferences, participate in online courses and webinars, and earn certifications in social media marketing to demonstrate your expertise. You could also seek out mentorship opportunities with other successful social media marketers, and stay up-to-date on the latest social media marketing trends by reading industry publications and following thought leaders on social media. With these strategies, you can build a successful career in digital marketing and advance your skills and expertise over time.

Here are some steps to start your own digital marketing company:

1. Develop a Business Plan: Develop a business plan before start a business. This should include your mission statement, target market, marketing strategies, revenue streams, and financial projections.
2. Choose a Niche: Consider specializing in a specific area of digital marketing, such as SEO, content marketing, or social media marketing. This can help differentiate your company from competitors and make it easier to market your services.
3. Register Your Business: With appropriate agencies register your business. It involves business lisence, taxes and certification of permits. 
4. Build Your Team: Hire experienced professionals to help you build your business, including web developers, graphic designers, content writers, and digital marketing specialists.
5. Develop Your Services: Create a portfolio of services to offer your clients, including website design, SEO, social media marketing, email marketing, and content marketing. Consider offering customized packages tailored to each client’s specific needs.
6. Build Your Brand: Develop a strong brand identity that reflects your company’s values and mission. This includes creating a logo, website, social media accounts, and marketing materials.
7. Network and Market Your Services: Attend industry events, connect with other professionals in the field, and promote your services through digital marketing channels, such as social media, email marketing, and paid advertising.

Starting your own digital marketing company can be a challenging but rewarding experience. By following these steps and focusing on delivering high-quality services to your clients, you can build a successful and profitable business.

Also read: Social media marketing