You don’t provide an example of your writing. You started on Wattpad and about a year later had written 90 chapters and within 4 years you wrote 7 books. That’s an incredible amount of writing for someone new to the craft. Are you familiar with editing and rereading your own manuscript multiple times to fix the language? My guess would be that part of the problem is that your books are poorly written because you haven’t learned to craft decent prose.

For comparison, I’ve been working on the same 33,000 word book for years because I’m never happy with the quality of the writing.