I made the jump from iOS to GrapheneOS a couple years ago. Definitely one of the best decisions I've ever made.
It does not have Fdroid available by default, so Download and Install the APK.
I recommend the Mull Browser, as it gives you access to about:config settings and you can install a lot of extensions. I do recommend using NoScript extension on Mull and then using GrapheneOS's Vanadium browser when you need JS.
On Mull, install ublock origin and then paste a custom filter into it to bypass paywalls. I like this list. Even though it's not piracy related, I also recommend looking into the Libredirect extension.
For YouTube, I recommend using Tubular. It's a Newpipe fork that supports Sponsorblock.
Enjoy and good luck.