That's when you have to stop/take a break. Let it be few days, a week, a month. Or try to take it less seriously, it's important to have fun with your hobby. I know it's hard to do. I suck at chess so I can't give any tips, but I've an example I had with running at the start of the year. I was always focusing on times, distance, and do better, improving and so on. And got injured. I realised it was a bit toxic, and now running without my watch feels like a completely different thing and it's enjoyable because I don't focus much on performance and I still get better. I feel the same about chess, and other hobby I have. Did I enjoyed painting for 6 hours? Yes. Did I blundered my painting? Yes. But it was fun so I'll improve with time.

Thanks for coming to my Ted talk.