Gonna go against the grain, and recommend browsing the instance list and browse whichever instances look interesting to you locally, and then make that your “home” instance. Lemmy’s connectedness is equal in importance to its disconnectedness, niche instances thrive and create interesting experiences, while federation allows crossover and further engagement.
Using Lemmy for its “all” sort is more of a replication of Reddit, while leaning into the strengths of federation can create a more unique experience IMO and usually a more pleasant one.
And finally, welcome!
I don’t know what to tell you, other than that a lot of the most active users of Lemmy.ml are Anarchists, and most communities on Lemmy.ml are not affiliated with Marxism to begin with, even if you include communities like World News that are more politically focused as “Marxist.”
Either way, I wouldn’t call Lemmy.world more tolerant, but tolerant of a different set of views. Lemmy.ml is more broadly federated than .world is, while .world selectively defederates from instances it isn’t aligned with politically. Even further, OP is on Lemm.ee, just asking on Lemmy.ml’s AskLemmy community, which makes sense as one of the biggest AskLemmy communities.
I’m not even trying to dig on Lemmy.world or anything, I just want to point out that it’s not really accurate to consider Lemmy.ml a Marxist-Leninist instance, unlike Lemmygrad.ml, or even Hexbear.net which is an umbrella Leftist instance.