How to increase breast milk supply???

So I’m wanting to know what some of you ladies have done to increase your breast milk supply.

I know the best way is to have your baby latch more frequently but since my son has a tongue tie that has yet to be fixed so that’s not a possibility at the moment. My right breast has a decent supply but my left is really low. His tongue tie is supposed to get fixed in the next couple of weeks but I’m getting nervous my supply will disappear before then. I pump regularly already and always go atleast an extra 5 minutes after both breasts have been fully expressed.