I used to play a game called "Spiral knights" it's free on steam.
I played that for years...
It's good imo, doesn't require a good computer and isn't REALLY pay to win.
The only advantage payed players get is in game currency, pretty much everything else can be bought with in game currency.
There's an E-Bay type auction house feature,
I like the pvp quite a lot,
There isn't exactly an immersive, fascinating storyline but it has enough missions and whatnot to keep you busy
If you don't find anything else, you might want to look into it.
Another thing was PSO2 but that is quite a nuisance to get and when you do get it, a lot of it isn't in english..