yeah, the Quarantine rules are always changing (at the moment is if you have had 2 vaccines you do not need to quarantine from the EU but that may change in the next week) they are pushing people to get the 3rd vaccine (Booster)
Well, I have had my 2 Vaccines in the Summer of 2021 and I still caught CoVid in late OctoberI know how frustrating this is. I also planned travel in February to the Orlando theme parks, but as rules are ever-changing, and who knows how governments react to the new Omicron variants, I better decided to skip this year too, as I hate worrying about last minute flight cancellations and changes in the travelling rules with short notice. (We are all vaccinated in the family, and for your safety, I'd advise all of my friends to get vaccinated... well... my enemies should decide as they wish...

I would say to Lyen get vaccinated and we can wait until spring or even later it's better to be safe.