As far as I can see having only one kidney means you have to take good care of yourself.
Watch what you eat, exercise a lot things like that.
There don’t seem to be any major risk. But some people report issues.
It is important to be aware that, although risks across the board are generally very low, every individual is different and it is possible for other uncommon complications to occur. For example, although rare, on-going fatigue and persistent pain have been reported by small numbers of the thousands of living donors.