Should I update my iPhone 13 mini to iOS 26.2?

The phone I am currently using is the iPhone 13 mini I got back in July 2022. I’ve notice that my battery health has significantly decreased from when I first got it (the maximum capacity for it now is 75%). I also have around 36GB left out of 128GB. Currently my phone is still running iOS 17.6.1, but I am intrigued with the new iOS update and its new features. I’m not too knowledgeable on iOS or how it works, so with how my phone is functioning right now, should I keep my phone the way it is or can I update my phone? I’ve heard from different sources saying that this update ruined their phone but others say it’s great. Any suggestions/advice?