(For your own privacy and security, please do not post your full, unsanitised debug log output here. When providing a debug token, please post just the token that is shown once the debug finishes, preferably by copy and paste.)
Your debug log shows your Pi-hole to be operational, having received and blocked 10,498 out of 20,152 DNS queries so far:
[2020-09-27 19:40:40.434 8267M] Imported 20152 queries from the long-term database
*** [ DIAGNOSING ]: contents of /var/log
-rw-r--r-- 1 pihole pihole 26373 Sep 27 20:25 /var/log/pihole-FTL.log
-----tail of pihole-FTL.log------
[2020-09-27 19:40:40.435 8267M] -> Total DNS queries: 20152
[2020-09-27 19:40:40.436 8267M] -> Cached DNS queries: 3741
[2020-09-27 19:40:40.436 8267M] -> Forwarded DNS queries: 5913
[2020-09-27 19:40:40.436 8267M] -> Blocked DNS queries: 10498
[2020-09-27 19:40:40.436 8267M] -> Unknown DNS queries: 0
[2020-09-27 19:40:40.436 8267M] -> Unique domains: 553
[2020-09-27 19:40:40.436 8267M] -> Unique clients: 20
If ads are still showing up in places, How do I determine what domain an ad is coming from? might help in finding that offending domain.
Also, ads that are served by a site via the same domain as the content cannot be blocked by a DNS filter like Pi-hole, unless you are willing to block that site's content also. Youtube would be the prime example for such a site.