Also, get some of this. I do this after the Flonase and my sinuses don't get so dried out. It seriously works.
I also have a facial steamer which works awesome if you're really stopped up or dry sometimes.
I am pretty sure I had covid in January thru February. There were a couple of days where I thought I might have pneumonia and my right lung kind of felt like it wasn't inflating and I couldn't get a full breath. I ended up using my steamer and inhaler intermitteningly throughout those two days and it really helped me open things up.