A break is good (and maybe even the best idea) but sometimes isn't always viable. Try and really figure out WHAT you think is going wrong. If it's your aim, temporarily change your sens for a few games. If it's your positioning, temporarily try a different agent, or play more or less aggressive than you normally play. You just need to find a way to break the cycle and force yourself to be uncomfortable for a little.
Side tip: I find that keeping an aim trainer open is super helpful for staying warm in between rounds. Games like Halo and CoD have the benefit of always keeping you "activated" while Valorant definitely doesn't.