You can get a climbing hangboard and hang it over a doorway. Do a pyramid training (2, 4, 6, 8, 6, 4, 2s with 5s pause in between) and your fingers and wrists will get much stronger
I use a Beastmaker 1000 hangboard and follow the Emil's Sub-max Daily Fingerboard Routine on the app Crimpd each day. Absolutely amazing results within a month. I really suggest everyone gives it a try.