Need help solving and escalating my issue to higher tier support

For months now I am having this issue with my internet where my internet becomes nonusable for a couple mins to 15+minutes multiple times during the time between 7-8PM to 11PM. I have contacted xfinity multiple times and asked for escalation that never happened as far as I can tell (just like the credit that was supposedly issued to my account for the inconvenience,) swapped out to new xfinity modem, cables and having a tech coming out to check out the connection outside my apartment. I have had a tech coming into my apartment before for a different issue and they confirmed that my wiring at my apartment is good. None of this have ever fixed my issues. Restarting my modem sometimes help kicking the can down the road but never a perm fix.

Can someone please help me and escalate my issues to a higher tier support.

Here is a snippet that highlight my issues:

1) when my internet starting to act up:

Discord voice ping starting to elevate.