61 yo and relatively fit and healthy. Jan 2022 unvaxxed and caught Covid. Didn't know I had it until close friend advised me he had it and we'd had a few drinks together. Noticed slight headache after day 2 but nothing else. Got Novavax in March as I had to fly overseas. Caught it again in October. Sore head for a few days and tickly cough. Vaxxed / unvaxxed didn't make much of a difference, so either your immune system is up to the task or needs some help. Work colleague with heart issues and triple jabbed caught it twice and no real issues. Then caught flu which nearly killed him.
