I'm not a high roller, but I've a great credit score and have managed to attract the interest of credit card companies. So far I've simply been getting cards with large sign on bonuses and low minimum spends, with the intention of cancelling them later if necessary.

This means I have a bunch of cards with miles/points for each dollar spent, but not a lot of income/spending to earn miles in that way. Short of buying dollar coins, what's the best use for these cards? I happen to be able to pay rent by credit card, but that's only a few hundred dollars a month, so it won't result in even a domestic ticket quickly. I've been using rents payments to quickly hit minimum spend.

Thanks!