I’m using https://github.com/Tonwalter888/YouMod on my iPhone and I’m very satisfied. It has integrated adblock, sponsorblock, and despite being modded stock YouTube app it has tons of features, like completely removing shorts from the app, customizing the UI, and more.
i had a look at yattee, but it looks like there is only the possibility to sideload it to ios devices, which you would have to do every 7 days, or am I missing something? The repos is unfortunately very sparse with installation instructions