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Some solid advice in here.
I’d also check the coils inside the unit. Look up under the filter you pulled. Coils are probably over that. Get a flashlight and have a look.
If they’re coated in gunk, they make spray cleaners that dissolve the whole mess.
Not cold enough, or frozen solid, sounds like nasty coils to me.
We used to make fun of people like this. Humiliate them. Alas, no more. Everyone’s opinion is now valuable.