Long time slump - how to get out?
For the past couple years, say 4 or 5, I have been in a slump. For some context, I'm a NTRP 4.5 in my late 30s, was even 5.0 for a bit. I'm in decent shape, I hit well when I practice, but I just don't know how to win matches. It feels like I just can't win matches anymore. I feel slow on the court, whether it's my thinking, speed, or reflexes. I used to win quite a bit, but I'm unsure what happened, I slowly stopped winning.
Nowadays, whenever I'm about to play a match, I think if I'm going to lose again and prove that I'm a bad player, to everyone and to myself, again. I know this puts too much pressure on myself. I understand that nobody cares and it's just a hobby, but I don't know how to actually make myself to not care. I want to win and know that all the time I have spent practicing is not for nothing, and prove that I'm a decent player.
Again, I KNOW that I should relax, not think about winning or losing, have fun, all that, but how do I actually do it? How do I get out of this long time slump?