I'm definitely a bit of a newbie when it comes to VNs, but here're my thoughts:
- Doki Doki Literature Club - Great VN to start off with if you don't mind some horror. It's especially effective if you've played a number of VNs already
- YOU and ME and HER - Where DDLC is more suited for a general (western) audience, YOU and ME and HER leans more heavily into being a visual novel. It's a pretty good time.
- STEINS;GATE - The absolute masterpiece that everyone recommends, and is one of my all-time favourite sci-fi stories featuring time travel and the realistic ramifications of such an ability. If you've already watched the anime, there's lots of content it glossed over so as to find in a 25 episode series, such as the entirety of Chapter 7, and an optional section of Chapter 9.
- STEINS;GATE 0 - Sequel* (not actually a sequel, but takes place during the true end of STEINS;GATE) to STEINS;GATE, and is one I've been making my way through. It's also a great time, and explores some pretty unique ideas for its time.
- Phoenix Wright: Ace Attorney Trilogy - The classic DS game remastered to a PC release, its humour still holds up to this day, and it's a really nice balance of visual novel style text after text, and actual gameplay mechanics. I would encourage the use of a guide if you struggle in some court cases, as it's not always obvious what you need to be doing.