How to clear excess mucus in lungs?

Good day everyone, I've been noticing lately that I've been experiencing a build-up of excess mucus in my lungs, and it's been causing me quite a bit of discomfort. I'm wondering if anyone here has any tips or advice on how to effectively clear this excess mucus from my lungs. I've tried drinking plenty of fluids and using over-the-counter medications, but so far, they haven't been providing the relief I'm looking for. Could someone please share some natural remedies or techniques that they've found to be effective in clearing excess mucus from their lungs? I'd greatly appreciate any suggestions or advice. Thank you in advance!