The main concern about an unlevel floor is why is it unlevel? If you can figure out the “why”, that will tell you if it’s easily fixable or if it will potentially get worse.

How hard it is to investigate depends on how accessible the underside of the floor is. It’s going to be pretty hard to tell from the top side without ripping off the tile first.

If the room has a crawlspace or basement underneath and you feel like playing detective, get a bubble level and go check the joists and beams in the vicinity. Work downhill until the slope stops. That will give you a general area of the source of the problem.

There could be a variety of causes, some of which are obvious, some not as much.