I never expected to lose my ability to play chess, but it happened. My mind is no longer able to function as it used to, and this has gradually started happening with competitive programming as well. I don't know how to fix this, but I think it's a rough psychological period that has lasted for more than six months.
sorry for my poor chat GPT English
Having 3 bad contests in a row doesn't mean you're "losing power". You can't accurately gauge your skill off of only you best or worst performances. Skill is something that comes from practicing consistently and learning from your mistakes. If you're doing that honestly then your skills can't be getting worse.
perhaps long-term side effects of the covid vaccine?
you can see this guy was stuck at Specialist for about 4 months https://i.imgur.com/cnb0gXN.png
But that doesn't mean he wouldn't get to Expert or higher. In reality, he is now a Grandmaster and is also participating in IOI!
No matter how many times you fall or how slow or how fast you improve, if you keep practicing you will get better.