Covid vaccine and boosters did nothing for me WRT Covid.
The only symptoms remaining 9 months later are some lingering inflammation, especially in the joints. I never had knee or hip pain until about 3 month into my long Covid.
My Pulmonologist said her "older" athletes take at least 6 months and often 12 months before they report back to their normal levels. Some people recover very quickly. I did not. Maybe I rode too much but my volume was about half and intensity was much less than normal. All rides were at a HR of 105 bpm and rarely higher