Make lots of good observations yourself. By that, I mean clear photos of easy-to-identify species (with a few harder species scattered here and there, of course). That gives identifiers something to work with. I am impatient, so I get frustrated when an observer posts lots of photos of far-off birds or shriveled and tattered brown leaves. That means you need to learn some of the species around you well enough to ID them yourself and thus to take identifiable photos. You don’t need to be an expert, mind you; you just need to know a little bit.
Related to that: learn as you go along here in iNat. I know I’m not an expert in anything, but I thought I knew something when I started using iNat a little over a year ago (I am a professional biologist, after all), but, boy, was I wrong. I have learned so much from making mistakes here on iNaturalist and then - and this is the important part - seeing what others had to say about my photos and learning from that.
Make observations in interesting or unusual places. I live in Massachusetts and while I take lots of iNaturalizing walks in ordinary woods, I also try to explore bogs and talus slopes and floodplain forests.
Follow good iNat observers who post observations from your area, of taxa you are interested in. Then, confirm their IDs when you can, but also look hard at what they are observing and where. You’ll probably find that local people you know of are already on iNat; definitely follow them.
Tell your real-life naturalist friends about iNat. Maybe only 10% of them will join and post very much (iNat isn’t for everyone), but the few that do - well, follow them and invite them on field trips.
Be patient and humble (I’m not good at either, alas, but I’m learning, I’m learning). That works both for cultivating an iNat community for yourself, but also for exploring the natural world.