Botox, Dysport Immunity After Covid Vaccine - Could Xeomin work instead?

Hello, I am a healthy 43 year old female. I have been getting injections (Botox then Dysport) for the past 6 years with no problem. However they stopped working entirely after my last Covid booster. I have had gone 5 times since October and have tried switching back from Dysport to Botox but the result has been the same…nothing. Could Xeomin work instead? I’d like to give it a try but am nervous having spent so much so far with no success.