You can’t just go to lemmy.com, create a name and password, and start doing stuff.
Go to https://lemm.ee/
Have a look around, see if the content and the formatting is appealing to you, register an account if you want to be able to curate your feed further
Go to https://lemm.ee/c/newcommunities@lemmy.world to see communities (equivalent of subs) that might be interesting to you.
Use Voyager as a mobile app: https://www.lemmyapps.com/Voyager. When they ask for your "instance", use "lemm.ee"
If you want more choices for apps, have a look at https://www.lemmyapps.com/
I think the Lemmy devs political stance and instances such as hexbear are more detrimental to the success of the platform than the entry bar.
Edit: Discuit is a centralized site, and now has 209 weekly active users: https://discuit.net/DiscuitMeta/post/OiU8YjZ_
Definitely