Any reason to hold off? If you react badly to the shots, I can understand that, but otherwise there’s little harm in getting the shots you can get now, and if a combo vaccine ever does come out you can get that then :). Seems the science is saying more boosters is probably better, which makes sense, so I’m going for them personally. I figure even if the booster knocks me on my ass the real disease would be worse. It’s your decision ultimately, and I’m happy you got vaccinated and boosted in the first place, but if you don’t react poorly to it I say go for it! Might as well get all of the advantages you can :).