$800-$1200/mo on AMEX Gold only in 4x categories. On the rare occasion I actually buy a flight I would put it on the Gold card for 3x. Of course use the card for relevant AMEX offers. I’m currently getting 5x on groceries with the Shop Rite AMEX offer.
Currently putting unbonused spend on Blue Business Cash for the $500 for $15k spend in a year, 0% APR for 12 months promo. That’s 5.33% cashback plus the 2.XX% interest I’m getting by making minimum payments.