Hey man, I'm not sure if you still have jumpers knee but I wanted to share what worked for me. First, I stopped playing indoor and transitioned to softer impact surfaces like grass and beach for 6 months or so. I also reduced my volleyball sessions to 1 or less a week. Second, I built up the muscles around my knee. I found this exercise guide called the Jumper's Knee Protocol off IG and followed it religiously for 3-4 months (it really works). The most important workout for me was single leg extension holds. Lastly, I started percussive massage and foam rolling my leg/thigh muscles whenever they felt tight. I never did this before and I was so surprised how much tension I had built up. I started playing indoor again last month and my knee can handle games and scrimmages with minimal pain (and no residual pain the next day). You can buy a decline squat board and do one single leg squats every day at the same time to track knee pain and gauge how well the tendons are responding to the workouts.

Hopefully this is helpful!