IMO instructing is not something you can keep doing in the long term very easily.
you give a lot of yourself instructing, always giving information and getting very little back, the students slowly suck the life out of you and after 1000 hours or so instructing it is very hard to be patient with them like you were at the start, as you see the same mistakes over and over and over.
as a part time thing with other flying on the go it is sustainable, but i think you do need to move on to other things.
regards
CF