Somethink like this except that it is done with the tongue and a finger:

https://invisiverse.wonderhowto.com/how-to/clear-your-stuffy...

I need to clarify that i did not have a sinus infection though, i had a persisting rhinitis for which doctors could not provide anything else but prescribe over the nose drops or flonaise

Thanks for the tip, we’ll try it out. Yeah no doctor managed to find the cause of the inflammation yet, even after years of tests. Every doctor is like “yeah you should be fine” its kind of infuriating.