Most RSS readers still know how to find RSS feeds (through the autodiscovery headers that used to power things like Firefox' old navbar support). So people still using RSS feeds in 2022 (such as myself) generally still know how to find them, icon or not.

But yeah, bringing new users to RSS in 2022 is a hard advertising/teaching experience. Instead of your RSS icon pointing directly to your feed in 2022 (because just about no browser today does anything nicer than wall of XML) you might try a more curated approach and link to an RSS reader you prefer and trust such as The Old Reader or Newsblur or something as.