The Monstera need staking and if you're feeling particularly brutal, chopping off a nice lump with nodes/air roots and sticking back in the pot (or another, to then present to somebody else so they also have an Audrey II to squawk 'Feed Me!' at them). You''re getting mushrooms and gnats because you're overwatering them. If they aren't fenestrating, they need to be in better light, maybe boosted up rather than at floor level.
The Adasonii are being overwatered, hence the guttation and going mouldy.
The succulents are etiolating because they aren't in good enough light and the orchid is in too bright a light; put the succulents in front on the windowsill and mostly forget about them, the orchid behind or on a northfacing windowsill and mist, rather than soak - they're meant to grow on pretty much fuck all in the shade of other plants, not be kept in soggy moss or completely ignored.
They aren't a pain in the arse, you just need to know what they actually need, which for the succulents is light and the occasional brief dunk in water, drying out in between, the orchid, benign neglect, and the others, less water and to be helped to do what they want to do, which is scramble up something to get to the light.
Said by the person who now has six Snake Plants, a crassula tree, three trailing crassula, an avocado tree, a Monstera that was 3 inches high and reduced to clear in Waitrose just after lockdown that is 8 foot tall, about 30 cacti, two pots of tumeric, one of ginger, tradescantia all over the place, 3 yuccas because DP kept buying them because he thought he'd killed them and their Lazarus-like recovery, some random thing that he thought was a spider plant but went from 4 inches high to three foot and enough spider plants to form a small army. The fuckers just keep growing.
ETA: Shit. Forgot the random thing that appeared on my desk at work that's now four foot tall. And DP's fern that turned into four plants after the cat knocked it over.