It's so weird, I was a big tennis fan since I was a little kid but I only started playing regularly at 12 (I had played semi occasionally when I was 10 but it lasted just a few months as we had to move house and it wasn't a priority for a while) due to my parents wanting me to try other sports first, despite me always insisting on tennis
As a late starter it took me a long time to get comfortable and unfortunately I didn't have good coaching for many years and developed "homemade" groundstrokes
this meant that until last year I never used the chopper grip (I think others call it the V Grip? Anyway, the grip you're supposed to use for a serve) and was serving with a forehand grip for 6 YEARS
I wanted to do the proper serve grip for years but once I was comfortable I was too scared to change
so my serve was a massive weakness (and my second serve was the worst thing in existence), but it's now a pretty good strength - so long as I'm not nervous af which sadly I get in tournaments.
My backhand used to be good but..again...I was hitting it with a forehand grip
so when I changed to the proper backhand grip last year it was like learning how to play tennis again
after about 6 months of doing the proper technique now my backhand is getting close to where it was before. My CC backhand has improved immeasurably, although the DTL is tougher now.
Learning the proper grip for volleys, slice, serve, dropshots and the backhand has definitely been a challenge
but I'm getting there and I'm happy I have a good coach now who I trust and I'm doing the right things with. Ironically, my backhand volley is better than my forehand. My forehand is weighty but adding spin in the last couple of years has been tricky because sometimes I get caught trying to hit a topspin forehand but I do not always pronate the wrist, so it just flies long