You have two things coming at you age and cycles!
The age of your battery is now over seven years old (2015 - 2022) for a battery which lifespan is about five years.
The cycle count is 233 currently, this battery has an expected cycle of 1,000 cycles (+/- 10 %) [https://support.apple.com/en-us/HT201585|Determine battery cycle count for Mac notebooks]
So I would say its already on borrowed time! Time for a fresh battery. You should be able to get at least 5 more years if you give it the needed TLC.