Well, if you're new to these then please, let me give you a few pointers as someone who's been into these for like 5-6 years now;
1. Owing to what we discussed above, much of the really good stuff is unavailable on Steam, so Itch is really the premier place to look for good AVN's (there are still a few fine AVN's on Steam, of course)
2. Most AVN's are shit: they are amateurishly produced and written, and use boring badly made stock animations. If you are put off seriously throughout the first 30 minutes of one of these, then it's probably not worth your time. There are exceptions where the dev really hit their stride only later on, but most of the time you can skedaddle immediately if you're bored.
3. Most AVN's that are good are in development hell for years and will be finished by the time you have grandkids (lmao), so get used to waiting for your favorite when it comes to it finally recieving updates.
4. Play Eternum, Out of Touch, Superhuman, and Sicae if you haven't already, these are the cream of the crop among the AVN's I've played over the years.
Hope this was helpful!