You are the one who has to live there, if it was me I would give it a bit longer. Have You looked into other social scenes besides ML?

https://www.internations.org/budapest-expats

I've never been there but if it's like any other city, moving a few KMs in any direction should bring you to a different community. Maybe You just ended up in the wrong part of town, with the pollution and an unpleasant vibe.

There should be some sort of promoting ambassadors organization where for a small fee, locals will properly introduce You to the city with a personal tour.

Unfortunately because of the pandemic most places suck right now.