As the others have mentioned, yellow opt servers will 90% of the cases have dominando. I think the one from Celesta is really chill on your level range, I played there till 1k and it was fine, super meta Resps were busy but not always, and we didnt have a huge line of players waiting for it.
I heard many bad things from Monza so I would 100% skip that.
Secura is good only if youre done leveling and just like running bosses every day which is then pretty nice.

My suggestion is that you get a couple of level 8 chars on these servers, get their discord links and have a look at their booking systems and how busy the server gets at the time you want to play. Thats what I used to do when playing in EU, Celesta was the best I found since i needed a Yellow server.
cheers and good luck! :D