Check/change filter, take a glance at the “A” coil if you can see them, (I can’t easily on mine) if they are one giant frozen mass, turn the a/c off and let it defrost, probably low on freon, and the a/c will work until it freeze again. If you can see the coil you can turn it off and see if you get a bunch of water after it’s been off some time, telling you the coil is frozen. Also make sure the a/c fins on the unit outside are pretty much clean and free of fuzz and dirt, you can carefully wash it, if it’s a mess, but the fins are easy to bend and mess up if you use too much water pressure and always try to shoot directly into the fins and not at an angle, be very careful. If they are really bad they make professional product to clean the fins, not sure how to go about getting it though….
Anything beyond that I’m calling out.