CL and Comcast are the two best-value options. Mountain Broadband services some areas wirelessly (WISP). HughesNet is always an option (Satellite). VZW/Sprint/TMo/ATT/etc (LTE). Any of those are going to be expensive vs. centurylink/comcast. Expect 2-3sec latency with Hughesnet if that's got any traffic on it.... makes video calls/real-time stuff quite difficult.
Are you actually saturating your ISP, or is the problem on the LAN side, with your wifi/switching/etc capacity?
Remember that wifi is half-duplex, so only one device can be "talking" at once. If you've got a couple smart-tv's pulling 4k video in, they're doing a lot of talking and not leaving much room for the rest of your devices to speak up.
What wifi channel(s) are you using - and where does that fall with regards to what your neighbors are using? While your neighbors are on different SSIDs, the access points are all sharing the same RF spectrum. When your neighbor's streaming 4k Pornhub for 3 hours a day, if you're both on the same RF channel that's all noise your devices are going to have to work through (lots of retransmits).
What up/down and ping times do you see now, and when your internet is "slow" during the day? Test this cabled directly to the modem, not on wifi.
Wire what you can - especially high-bandwidth devices like tv's or pc's doing netflix, file transfers, big video calls, etc.
Even just adding a 2nd/3rd wifi access point may help ease some of the RF congestion.
I cringe when ISP's (comcast especially, they're awful about this) keep trying to upsell their next service level or upgrade to some rental "GAMING ROUTER RGB 9000!!!!!@!!!1" when the problem has nothing to do with the wireline connection.
People often laugh at me when I tell them I'm pulling over half a mile of data cable in my house, "Why don't you just use wifi lmao"... A good wifi network needs a good wired network to ride on.
18 Gbps non-blocking throughput, 36 Gbps total capacity on the switch. 3 access points capable of 1.3 Gbps each. Lowest-tier (100/7) that comcast offers. I've got everything wired that I can. I'm considering putting fiber in between my core switch and office router. Neither my internet connection nor my wifi here has any issues. I'm out in your neck of the woods as well.
T1....
The 90s called, they want their broadband back....