Probably the best method would be to copy the mechanics from PoE2. Most spells had a limited to "per combat" , rest was mainly used to heal and restore some of the limited resources (although they didn't matter too much). Maybe it's not too in the spirit of D&D, but it would fix so many problems with the game. It seems to me that players aren't very used to limited resources these days. With the current game project, rest won't be too limited anyway. Currently, rest look more like it was implemented by force.
