I’ve never used TweetDeck but there is the Control Panel for Twitter, which makes it usable. It can auto-block all the bluechecks with under a million followers, hide the “For You” tab, block ads, and restore the old Twitter branding.

Unfortunately the main reason I use Twitter is not the platform itself, but the public figures that are on it. Mastodon (mostly) doesn’t have that, though there is a trickle of some coming over.