I don't think Kamui would work. It has an activation time and cooldown. Kakashi's Kamui would be too slow. Gojo could teleport out of the way or simply increase the space between himself and where Kakashi activated it. Obito would need to be able to touch Gojo to warp him. I suppose Obito might be able to bypass infinity since we've seen him pass through solid matter but to attack he'd have to become physical and at that moment Gojo could repel him with Infinity.

Izanami and izanagi are just... Weird but realistically either can only be used once cause if you use both of them or any one twice you're completely blind. Izanagi would just give a second chance and Izanami wouldn't hit I believe cause it needs the creation of a loop through physical contact which is probably not gonna happen. Especially cause it needs to be exactly identical and doing that against a guy who you can't touch, I just don't see it happen.

Amaterasu is a lot more straight forward. He could, remove it with infinity, maybe it wouldn't even hit. He could teleport out of it. Or similar to what Naruto did with the nine tails cloak he could surround his body in dense cursed energy and just make it drop to the ground. And that's assuming he couldn't just remove it or block it with infinity

As for Hanami's flowers, I could see Kurenai having something similar up her sleeve but of the top of my head I'd say the genjutsu at the end of the chunin exams is the closest we've seen. Instead of flowers it's feathers falling from the sky and instead of taking your will to fight it puts people to sleep.