I tend to get interested in certain ones in bouts. I played WoW for a few years a while back but haven't played it in a long time. The two that I tend to cycle in and out of the most are Guild Wars 2 and Warframe. Both are free games but they are the best "free" games I have played myself. I say "free" with quotations because you can spend money to get better items in both games but they aren't P2W games. You can enjoy both without spending a dime.