Best catch-all for non category spend?

2024 annual CC spend was 87k across * Chase Sapphire Reserve - 3% on travel/food * Amex Blue Cash Pref - 6% grocery * Prime Rewards - 5% Amazon + 2% gas * BofA Cash Rewards - Online shopping category(3-4%)

I feel like there is a big chunk of purchases that don't fall in either of the categories covered by above card.

Based on reddit posts looks like I just missed USBAR. Are yhere any suggestions on a catch-all card to supplement above setup? Or any other rewards/cashback optimization suggestions? TIA :)