You could give a try to guild wars 2. It's an MMO, it used to have an entry fee, but after they released the expansion the entire base game was made free, no strings attached. I really think it's worth playing at least once to see if you like it. It has a lot of genuinely good design decisions that separate it massively from a lot of other games in the market and you never feel like your time and effort are disrespected. Also, contrary to most MMOs there's a massive amount of emphasis put into reaction times, dodging and timing instead of just gear and stats.