Download official, fully featured app and not something utterly crippled
Looks and feels like Twitter
No weird tech mumbo-jumbo (WTF is a server, is that like a Discord server, what's that gotta do with Twitter) confusing you because there are no instances to choose from
Make an account
UI, UX, look & feel 100%, 1:1 fully identical with immediate pre-Musk Twitter
No need to get used to anything because literally everything stays precisely the same as what you're used to, only that it's no longer "Twitter" or "X" or "tweets"
Use it literally precisely the same as Twitter
Pretend you're still on Twitter, it won't make a difference

If Mastodon wanted to compete with this, it would have to

replace its default Web UI with an even more faithful clone of the immediate pre-Musk Twitter Web UI,
replace its official app with something that's absolutely identical to the immediate pre-Musk Twitter app in all but name and branding
remove the instance chooser without introducing any other option of joining any other instance than mastodon.social
completely hide decentralisation and instances from newbies, ideally for a few months or years after they've joined
introduce a content-forwarding algorithm like the one on X, but better
forcibly ban Mastodon's user-grown culture and force pre-Musk Twitter culture upon everyone
mollycoddle its users for months or years so that Mastodon really feels like "literally Twitter without Musk" by shielding them from not only all hints that Mastodon is different, but also from the entire rest of the Fediverse

[–] Eibriel@sopuli.xyz 1 points 3 days ago

Maybe wasn't that way before, but when signing up on Bluesky now you are asked to choose a instance (bsky.social being the default), and the username contains the instance name, exactly like any Fediverse account.