What should I focus on more, development or competitive programming?

The answer solely lies in your interest.

If you want to build websites , go for web development. There is a big scope in web development with it becoming a trend in 2021.

On the other side, if you want to build embedded system softwares and software development or become data scientist, you can opt for competitive coding. Codechef, HackerEarth, HackerRank offers competitive platform for coding.

You can also do Free-Lancing along with competitive coding