The best thing anyone can do is swap out the junky cable modem + WiFi router combos they rent to you. They're horrible under standard usage, bad when lots of clients are connected, bad wifi range, low memory, require frequent reboots, etc. For about $70 (about 5mos of rental charges) you can get a Surfboard barebones Docsis 3 modem that will vastly outperform whatever junk they rent out. After that you could get a TP…
This is a thing I would kind of want to do, but I've never bothered to figure out how. Like how will I know if it's a compatible modem, or better than what's there? How do you configure it? So those are my reasons.
To configure it, you just plug it in. I think you may have to call them after you plugged it in and then activate it on their end.