MacBook Pro Battery Health at 82% within 1 year of use. Will I have to replace this next year?

My MacBook Pro (2019, 13 inch) has currently 397 cycles as of this post. The original max charge my laptop had was 5103mAh. Now, it's current max is 4183mAh.

I got this sometime in middle February of 2020, so I'm surprised the battery is now like this.

This MacBook is mainly for schoolwork; editing videos, searching the net through RAM-eating Chrome, editing word files, usually has discord open in the background for the whole day and listening to Spotify. The only time the MacBook heats up is when I'm playing games with considerable graphics, but not too heavy on the GPU. (eg. Sims 4, Asphalt 9 & Don't Starve Together)

Is there something wrong with my battery? Will I have to replace the whole unit next year? I don't have AppleCare or anything... my average charge per day is 1-2, so it depends.