Reduce greatly the extraction and use of fossil fuels (cleaner energy sources, efficient and not for leisure travel) at the same time than massive carbon capture efforts. And I mean not to keep emissions as something is being captured, as some "green" alternatives are trying to be sold, like capture carbon into fuels that will be released shortly anyway.

At a big enough scale, GHG may start to reduce globally. That is the disease. Without that won't be any solution, just fragile mitigations in our way to the end of civilization as we know it. No matter how expensive or damaging it looks, the alternative will be always worse.

If, besides doing that, you want to add some mitigation to the warming, and that don't slow down nor stop GHG reduction, be may guest. But applying nail polish instead of stopping an hemorrhage is somewhat shortsighted, priorities should be clear.