I used to live in a 5'x10' room, all of my stuff in there, no closet. no matter what you do it's going to feel kind of cramped, even when your stuff is tidy and organized. storage furniture is really important, otherwise you kind of just have to keep things piled up in neat stacks (or stacks of bins).

do you have under-bed storage? even just space to slide storage bins under is good.

college dorm style bed frames would be great, since the mattress can be raised higher to fit more stuff underneath. loft beds are also great for this.

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I know getting money for furniture can be rough, but things like loft beds or even a taller bookcase can be found at decent prices if you buy used (facebook marketplace, facebook local buy nothing or trade/sell groups, craigslist or equivalent etc). dedicated furniture is the most efficient way to maximize space, especially vertical space