I do agree with everything said above, but I also know, for me at least, the advice of “do what makes you happy” can seem vague and a little frustrating in the face of so many options. There are more observations out there than I could ever personally look at! Where to even start?
Do I want to provide IDs to help observers? Which ones? Local people, for a sense of neighborliness? Faraway people, for a sense of globalism? Places where the observers seem to outnumber the identifiers?
Do I want to ID to help iNat as a community? Do I want to help other identifiers by providing rough IDs? Do I want to teach other people how to ID something? Do I hate it when people are wrong, and want to comb for mistake to correct?
Do I want to provide IDs because I want to learn things? Which things do I want to learn about? Do I have a favorite or particular curiosity?
Maybe you can set some sort of goal for yourself, ie, I want to review all of one family in this area, etc.