qlog files can be viewed using qvis (you’ll need to extract them before uploading them).
What would be interesting here pretty much depends on what your ISP is doing. If you see that after booting up your node, the first few minutes QUIC connections work fine, and after that time you run into connection timeouts, that would be a pretty clear sign of your ISP blacklisting you.
Other forms of interference might be harder to detect. For example, instead of blacklisting you entirely, they could just drop a certain fraction of the QUIC packets you send. This would be interpreted as congestion by QUIC’s congestion controller, and dramatically reduce your bandwidth.