If you are looking for blocklists to use on your Pi-Hole set, you may want to try lists suggested on the OPNSense site:
https://docs.opnsense.org/manual/unbound.html#blocklists
Personally I uses the lists below for my own setup:-
- Easylist
- Simple Ad List
- Simple Tracker list
- StevenBlack/hosts list and
- WindowsSpyBlocker
