Unless you are playing purely for nostalgia, I would very much avoid runescape. It isn’t a game for kids to play during typing class. It is very much an obnoxiously sweaty (set of) game(s).

I think you can play the entire original campaign for FF14 for free? And FF14 is probably THE best theme park MMO out there. That said, my experience is “it is the best community on the internet” is very much marketing and you WILL have bad experiences during dungeons… which are mandatory for story progression. You can negate that if you join a clan but then you aren’t really playing with The Community and are already into hardcore-ish play.

I don’t know where the free/paid demarcations are, but I would actually recommend Guild Wars 2 or Elder Scrolls Online for a newbie. The latter does suck if you want to do any crafting as a free player (and inventory management in general will be hell) but you are there for the overworld gameplay. And both GW2 and ESO are very much geared toward playing solo in a crowd. As in you’ll walk around the overworld which is basically a single area with 10-20 other players. You’ll do event quests together, see each other while you go to the store or walk toward an instanced area, and so forth. But you won’t have to worry about someone telling you they are going to <REDACTED> your family because you didn’t skip a cutscene or aren’t holding aggro properly in newbie dungeon.

If you get into those? You can maybe find a guild and play some of the higher level content. Or you can go pick up FF-MMO or WoW or even SWTOR (apparently it is still going).