Do you have an Android device? “Choices That Matter” is a Tin Man Games serial story app (two stories are complete and the third is updated periodically). The first story (“And The Sun Went Out”) is 600,000 words altogether so that’ll keep you busy for a while. It’s often bittersweet. Each tale has at least two romance options (and I’m in love with all of them, having invented some, written most, and edited all the ROs). It’s a REALLY good game (I say with a complete lack of humility - you can see a thread on it here at Choices: And Their Souls Were Eaten (fantasy steampunk) and download it at https://play.google.com/store/apps/details?id=au.com.tinmangames.choices&hl=en). On Google Play, you can watch ads to get through it for free (but you need to watch them again to replay it - with a story pass, you can replay as much as you like).
Also IF Comp games are all free (including the original version of my Hosted Game, Scarlet Sails). Anything that makes the top 10% is going to be excellent, but there are also loads of reviews all over the place so you can pick and choose to find something you love.