Hello Guys, I am interested in developing myself in E-Commerce and SEO. Any tips for me?

I have finished Google's E-Commerce Course on Coursera. However, I don't know how I should continue to develop myself. I especially want to learn more about SEO, lately, I have tried Ubersuggest and examined it for a week trial period. However, other tools like Semrush seems pretty costly. Are there affordable ways to access tools like Semrush? Also, how can I get practical experience? Lastly, do you recommend focusing on E-Commerce as a profession in 2025?