I have nasal congestion due to allergies every morning so here’s some advice that might help you.
You can try a Neti pot morning and night. The NeilMed ones at Costco pharmacies are good.
Use distilled water or boil your own for 1-3 minutes depending on the elevation in the area.
Once the packets run out you can measure 1/8 tsp baking soda, 1/8 to 1/4 tsp non-iodized salt (e.g. sea salt).
For prescriptions, Omnaris might work for you too. Gets things moving and doesn’t have the congestive rebound effect that over-the-counter nasal decongestants do.
All the other advice about controlling allergens is on point too. You can try an anti-histamine (e.g. Aerius) for a week to see if your congestion goes away but allergy meds dry you out a bit by design and gum you up so maybe this won’t have the effect you’re seeking.
You can get a sleep study for apnea but I’d say only if you’ve had actual fatigue related symptoms, not just what you’ve described here.
You could get a breath test for your lungs. Maybe there’s mold at your place. That tightness should be enough reason to get checked out, tbh.