I think you should stop if you lose most of the money because you're not fit with it.
If you don't fit with anything, don't even try to do it because that won't make you becoming success.
I think so, but if one person can still manage to work on it, then go but make sure to do your best and never repeat your to do the same mistakes again. Life is about taking a risk but do not suffer for risk without a good fight.