we do all of them!
Our cash back adds up to well over a $1000 a year. I love it and use the money for fun stuff, it’s been a while and I’m sure all of the cards added together is close to 2k
5% for quarters in Discover and my wife’s Citicash card for the highest spending category in any month pays 5% which we use for whatever category Discover isnt 5% so right now that is restaurants for 5% and as you said Discover for 5% groceries. I have a different Citicard and WellsFargo that pays 2% all year.
I also have a chase card that rotates 5% unfortunately right now it’s the same groceries so I have it put away for now.
It’s cool during Holidays with Amazon and Walmarts 5% at times
It’s really fun!