Your debug log shows that in the previous 24 hours prior to runnng the debug, the following traffic was processed by Pi-Hole, including 280 blocked queries.
[2020-01-08 20:10:58.323 6393] Imported 9790 queries from the long-term database
[2020-01-08 20:10:58.323 6393] -> Total DNS queries: 9790
[2020-01-08 20:10:58.324 6393] -> Cached DNS queries: 1767
[2020-01-08 20:10:58.324 6393] -> Forwarded DNS queries: 7743
[2020-01-08 20:10:58.324 6393] -> Exactly blocked DNS queries: 280
[2020-01-08 20:10:58.324 6393] -> Unknown DNS queries: 0
[2020-01-08 20:10:58.324 6393] -> Unique domains: 352
[2020-01-08 20:10:58.324 6393] -> Unique clients: 16
[2020-01-08 20:10:58.324 6393] -> Known forward destinations: 2
Let's take a look at some of the details and see what is being blocked and not being blocked. What are the outputs of these commands from the Pi terminal?
You will not be able to reliably block YouTube ads with Pi-Hole. Pi-Hole is a domain blocker, and YouTube serves ads from randomly-generated subdomains of the domain that serves the content. Very long running thread on this topic here: