I cancelled Prime just before the adverts started, absolutely no way I was going to accept a lesser service with ads or pay more money for a service I already had. Also, I don't get this obsession with Prime for the delivery reasons. Unless you're buying something inexpensive you can get free delivery and 9 times out of 10 it turns up next day anyway.
And since I've cancelled Prime I've found things cheaper on eBay many times, and the chances are you're supporting a small UK business buying from there, not giving your hard earned cash to a monolithic, tax dodging, employer abusing money making machine for Bezos.
And there's not much must watch TV or films on Prime Video anyway, if I were you I'd take the plunge and cancel, Joe!