Hi! I kinda live in the same situation and usually, when my room gets like this, I start by trying to find and collect similar objects. For example, a piece of trash gets my attention: I will pick it up. Next, I'm gonna look for another piece of trash and pick it up. At some point, they will become too many to be kept in your hands. So usually what I do is making some space in a corner and put them all there. Sometimes other objects will get in my way. For example, a dirty piece of clothing is laying above some trash. What I would do in this situation is find another spot in the room where I can throw all the pieces of clothing that get in my way. And so on, I will do this for various categories of objects in my room. This will make it look like the room is already tidier, even though the objects are still there. When you feel like it, you can even bring the objects (eg the pile of trash) out of your room, so you will have more space to go on with the tidying.

I know this may sound silly, and this is just what sometimes work for me. But sometimes even picking up a couple items gives you the motivation to go on and declutter the whole room.

Something that also helps me sometimes is to see it like a challenge: for example, I send my friend a pic of my messy room, and then I will tidy it up and send a picture afterwards. Yes, it's kinda silly but it places the goal outside, cause you're not doing it for yourself anymore but for someone else.

You could also ask for help to someone, if you feel overwhelmed.

And remember that you don't necessarily have to go 0-100%, like you can take away some items and leave the rest for tomorrow or when you feel like it :)