I've done a few things to accelerate spend for bonuses. Two ways simply time-shifted my spending. The best was prepaying my propane company. Leading up to winter we have a goodly bit of money stashed away to pay for propane in the cold months. I just called our company and asked to prepay $1,000. They were not only pleased, but I've actually been getting monthly interest on my balance! The second way was to buy gift cards for my regular grocery store. Again, this only worked well because I budget out 1-2 months ahead, so I bought enough gift cards to cover a future month's groceries. This might not be ideal if you need that money to organically meet a spend on another card.
As for other bills, Plastiq will take credit cards for things like mortgage and car payments. Their fees are 2.5%ish, so it's not usually worthwhile. You might also have an issue if you're trying to pay with a Visa and that payee does not yet have a relationship with Plastiq. Still, to finish off a spend it can sometimes be worth it.
Taxes can be paid for a lowish fee using credit cards, and I was surprised to find that my electric bill could be paid for a ~$2 flat fee directly through my electric company's website.
Finally, I have had luck with buying visa debit gift cards when they were fee-free and using them to load a Bluebird account and pay my bills from there, too. That process was cumbersome, and I had to get a Walmart teller to load the funds for me -- which meant I had to talk to a human being IRL <GASP>. I still have that method as a possibility if there is ever a really great deal on Visa gift cards, but I'll not go out of my way otherwise.