Whenever you're a newbie or an experienced veteran, there's always a point in time where you make a mistake in crypto land. After all, nobody is perfect. You might've lost all of your crypto holdings due to being careless, or simply lost an opportunity of a lifetime to grab huge profits. Mistakes happen all of the time, leading us to regret many decisions in the long run.
Probably not keep going with mining I suppose. I remember back in the day I was mining with my computer, this is very very old days when you can mine bitcoin with a laptop, that much back in the day. However when my laptop got a bit too hot, and seemed to act weird, I decided it was time to get a new laptop, it was getting older anyway, and I imagined that was caused by bitcoin mining, which was sort of right because that tired the computer out a lot.
However instead of stopping, if I realized laptops are not meant to mine, and I should get a rig, I would have been pretty rich by now. Obviously back in those days we didn't had these gpu cards and we didn't had these hash rates, I remember a huge litecoin right with only 40 mh/s back in those days, but if I kept going and did my mining, I would have been multi-millionaire by now, even if I sold every single coin I mined, I could have grown it at least.