The best alternatives to PiP-it are Fenêtre, Clicker for YouTube TV, and TabFloater. If these 3 options don't work for you, we've listed a few more alternatives below.
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Clicker for YouTube TV is a standalone YouTube TV player for Mac. Features include launching YouTube TV right from your Dock, touchbar controls, picture-in-picture, live channel guide in the Menu Bar, dark mode, and much more.
TabFloater improves your productivity by providing a "Picture-in-Picture" functionality, but it's not limited to video - you can use it with any website!
With Videos In PiP (V.I.PiP), you can finally watch any video 🍿 from apps that restrict it (including YouTube) and do other things at the same time on your iPhone or iPad. If you have any suggestions, please let me know 🙏🏻