If you want to broaden your horizons, you should try some Yuri VNs. The ones I will recommend are NOT sex-oriented, as I believe you won't enjoy those.
SeaBed - One of the best narratives out there. It's a drama/psychological mystery full of twists and nice moments. One of my favorite VNs.
Flowers (series) - Romance-focused, the four games share a central mystery, but the romance is more proeminent.
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Now, other non-LGBT+ games:
Horror/Mystery - Umineko no Naku Koro ni. Great worldbuilding, characters, plot twists and intriguing plot. However, it doesn't have the routes/heroines structure, although there is a lot of romance.
Mystery - Mamiya [buy the full version on steam] - Great mystery game with many plot twists. Can't talk too much about it without spoiling it.