Haven’t tried it myself but have heard good things about this game. A popular MMORPG that is still in active development is free until May for Twitch Prime members (Amazon Prime).
This is just for the base game and does not include any of the expansions.
In the base game, you can play up to level 50 and do all the content before the first Heavensward expansion. The Twitch Prime offer also gives 30 days of play time, which is more than enough time to get one or more of your favorite jobs to level 50. (The best part about FF14 is that your one character can be every job. No need to make alternate characters!)