An underrated choice, especially if you rent, is to get the Bilt card. It's sort of my "tertiary" card with Savor One and Venture X.

You get some points just for linking various airline/hotel accounts, you get 5x on all spend the first 5 days, you get 1x points on rent without fees, you get double points on travel and dining (4x and 6x respectively) on the first day of every month ("Rent Day" at they call it).

For instance, if you love booking Southwest flights, book them on the first day of the month directly with SW and get 4x points on the flight with Bilt. You can do that with any airline really but I'm just saying you can't book SW flights through the C1 portal.

Have a date night or go out with friends on the first of the month and get 6x on dining.

No annual fee, no SUB but they also have fun ways to get points for free like quizzes every month. I've racked thousands of points in just a few months with very little effort.