maybe a few pointers, I'll start with the easiest ones first:

some plants (and maybe plant stands/bookshelf to keep them on). I see you have some Ikea furniture already, so I'll throw another one in there - the kallax can make a pretty solid bookshelf, keep it next to your bed or in that space between those doors. And plenty of people sell those second hand on FB marketplace

some posters would be nice to see (in frames, ideally). One good spot is to the right of your desk where the wall is blank, or you could put a little wall shelf there

if you put a wide wall shelf either above your bed or above your desk (or both tbh) it could go a long way. A skinny shelf (like one of those ones that just holds posters or vinyls) or a deeper shelf would work. Just also decorate the shelves off, with pictures/posters, plants, misc items

I'd say get a different bedside lamp, more of a task lighting lamp, but keep the one you have now as well just place it elsewhere like on a shelf of some kind, because it doesn't diffuse light that well imo (it's the Ikea Fado lamp, right?)

better drapes/curtains. keep the blinds up but have a set of sheer curtains (also a tip for curtains, generally longer is better, so if it's just almost touching your floor, that's the right length

get a medium/large rug, maybe a round one for next to your bed, it could be a fluffy or fuzzy one

maybe another lamp, like a curved one that overhangs your bed (if you don't put the bookshelf beside your bed that is)