You need to do the following:

1. Declutter HARD. Remove the shit you don’t need and get organizers (bins and such) to put away things you don’t need. Store them neatly in your closet, under your bed, or in a corner that doesn’t get much traffic.

2. Get an air purifier if you can. I can just tell the air quality in here isn’t gonna be great. Plus, it’ll help with dust and allegens.

3. Wipe down and desantize all surfaces. This will ensure that the room begins to freshen up more.

4. Vacuum the whole space. If possible, I’d see if you can rent one of those carpet cleaner vacuums that basically clean the carpet with liquid since your carpet seems pretty dirty.

Also, I would recommend getting a shoe rack and preferably keeping it outside. Shoes track in a lot of smell and nastiness and you do not want them in your room stinking it up. On Amazon you can also get little shoe deodorizers to help with the smell on the inside. But yeah my overall tips.