I’d recommend the Working Title CJ4. These guys are geniuses and if you like the Longitude this should give you a very good experience. I just ignore ATC. Sometimes you can get a good ATC experience but a lot of the time it’s just going to be awful. Been that way since the beginning of time, or ummm beginning of flight sim. Or like others above have suggested use Vatsim or similar but before using those I’d go through the numerous tutorials so you don’t look like a fool on your first flight 
. That’s the reason I still haven’t even tried it even though I’m sure I’d be fine on there.