Any tried and tested methods for unblocking my nose please

I have some that may be helpful.

Have you considered that your blocked nose could be caused by an allergy, either to whatever your pillow and duvet are stuffed with, ,or to the washing powder you wash the bed linen in?

I am allergic to synthetic fabrics and to perfumes and one of the symptoms has always been a blocked nose.

House dust is high on my list of things that must be avoided at all costs too.

Both Otrivine and Vicks could actually be making the matter worse, not better.

I hope you get over your Covid without too much bother, and find out what is causing your blocked nose.

I don't have any helpful suggestions, unfortunately, but I do share your pain as I also have covid at the moment and I'm suffering in the same way. Tried everything I normally would, including Vicks, Sinex etc but nothing seems to be working. Having no sense of taste or smell is awful...

Vicks Sinex spray always works for me.