It happened to me as well. When I got my tablet, my skill went back to a newbie but eventually, I got used to it after a week, maybe faster than some people
Tablet brings you a new experience, and maybe a better way to improve as most high ranks use tablet. Ofc you can be different but tablet could be fun and worth to play
You can try using a multi-functional tablet driver like OpenTabletDriver, try adjust your tablet area that fit you or take reference from top players's area. Try to play in a few weeks and you'll see the differences