Rechargeable batteries can lose some initial charge quickly and the last for a long time at that level before losing capacity, some will hold initial capacity for a long time and then start to lose capacity, some will start slowly losing capacity from day one, and any other possible combinations. It is just the nature of rechargeable batteries.
FWIW, don't try to micromanage your battery and just use the Mac. If you reach a point in time where the working time on battery is not long enough to meet your needs, then start to worry or just get the battery replaced.
I bought an M1 MacBook Air back in 2020 when it first came out. Within 6 months it dropped to 91-92% and has been sitting at the level ever since.
If you still truly believe that this is an issue, contact Apple Directly ( https://support.apple.com/en-us/HT201232 ) or set up a Genius Bar appointment at the nearest Apple Store or at the nearest Apple Authorized Service Provider and have the Mac evaluated.