Call and say the words “I would like to cancel.” You’ll then get on the line with someone whose directive is to try their best to keep you as a customer.

If you’re on the SoBo peninsula then you might be able to get Verizon FIOS. I don’t believe they have it west of 395 though, so your other option is mobile Internet from Verizon or T-Mobile. FWIW, I’m in Pigtown and my phone’s 5G signal rarely goes out - my speeds are currently 40 down / 4 up. Idk if that translates to the signal home mobile Internet would receive from them though.

I’d call Comcast and negotiate, and compare that to whatever the others are offering.