I have recently made some mistakes at work which might reflect badly on my reputation as an employee. Nothing similar happened before, I just had a temporary streak of underperformance. Additional external stress might have played a role in this. Those mistakes were not extremely serious, but significant enough to put me on the radar.
I treated those mistakes as lessons and made adjustments to avoid similar situations in the future, even in case of additional stress. It is doable.
My supervisor has treated me very leniently and did nothing, but I actually treat this as a sort of favor. I am expecting to get an official reprimand in case I don't correct myself soon.
Should I leave it at that? Or should I go to my supervisor and tell that I would like to repay this with some additional work?
My supervisor is constantly overworked and I often have some free time at work, during which I can't really do anything but sit at my desk and wait. I do get bored and I would like something to do to make the time go faster.
What would you suggest? Is asking for something like this sensible or maybe it could actually reflect even worse on me? I know from observations that when my co-workers make similar mistakes they don't do anything about them (some actually try to cover them).
Also, competition at my workplace recently increased due to raises and I would really like to stay as far away from the bottom of my group as I can.