Offering three suggestions, based on my experience with both Sleep Apnea and Post COVID Syndrome...

One, check the quality of air in your bedroom. Make sure you minimize the amount of dust, and make it as easy as possible to breathe. I have a mild sleep apnea issue which can be triggered if the room is under 72° F, because it's like my brain decides that the air is uncomfortable to breathe therefore it should breathe less. After covid, I keep my bedroom at at least 79° F, with at least 60% humidity, because that's what I need to be comfortable. Finding your new preferred temperature and humidity may give you relief at home.

Second, try a breathing exercise: breathe in, fill the lungs up so you get them stretched out, and relax to let it be pushed back out. Do this 3 to 5 times, a couple times a day, including when you are lying in bed to sleep. The idea is to stretch out your lungs to make breathing as easy as possible, and to train your nerves to breathe in in general.

Finally, look into a CPAP machine, even if it's not every night. They are very effective and getting very small and unintrusive.