You can try a technique called back building your buds. It's not very complicated. it just required you to snip the tips off every bud which then forces them into filling out and growing more dense. There are ton's of video's and instructional web sites out there that can go into further detail.
https://www.420magazine.com/community/threads/las-quick-guide-to-simple-backbuilding-technique-for-buds.209274/
here is one such link!
Hope this helps! Happy Growing Looks GREAT!