Lol I forgot (imagine that!) to add that I try to start each day with 8 ounces of water, then I have either green tea (the kind with caffeine because heaven knows the extreme fatigue is always present) or I squeeze the juice of one lemon (organic if you can find them) with honey and hot water. Both beverages help thin the mucus in my throat.
At night I sometimes have more green tea, (minus the caffeine) and soak in as warm/hot water I can tolerate with Epsom salt for 20 minutes, letting the bathroom steam up. This serves a dual purpose, it seems to help with the drainage & mucus issue and promotes sleep which is another major problem. Hope this helps you too. Also try to find a good ENT that’s not surgery/procedure only oriented. Mine is terrific, I have had Balloon Dilation pre-Covid, which helped then and continues to help now.
Fingers crossed all will find some degree of relief soon!