It is generally known in the artist circles I hang out in that Twitter’s algorithm loves to hide links to Patreon. They may also hide tweets that merely mention it, as well as other words crucial to the business of being an artist online like “commission”, which leads to creative misspellings like “Half off on c!miss!ons for my Petreon supporters this week!”.
(Twitter loves to hide off-site links in general. Leaving the site means you’re not scrolling down your timeline and potentially seeing ads any more!)