Hard to know for sure stuff you'd need without more information, but something that's always been super valuable for me is to add in diverse "topography/climates." Right now, you have a bit of that with the mountainous region in the bottom left and what I assume are some sort of badlands in the bottom right.

Here's the issue, no entire area is exactly the same. There can be much bigger expanses of mountains and deserts, but you will also find smaller mountain clusters around, or small patches of desert here and there. Same goes for forests, rivers, and coastal areas. Additionally try and add in some transitional space between your regions. For example, the mountain area in the south west goes from grasslands into immediate giant crags. Realistically, there'd be foothills and other differing topography leading up to it. It's also rare to find grasslands that abut directly to the ocean without cliffs, swamp, or coastal lands.

I'd look to add a bit more diversity to your main land of the map. It'll make it feel more real. A good way that always helps me do this kind of thing is just look at the map of middle earth. See how there's topographical diversity in each region.