I’ve always has a problem with earwax build-up- inherited from my mother I think. Never used cotton buds as heard they could make ears worse. I once had them syringed at docs and then decided on diy job with old icing syringe! Probably not recommended, but works for me.
I fill basin with warm water, then fill syringe with fairly small nozzle on end and squirt into ear, holding head over basin. Have to do a few times each side before I’m rewarded by blobs of very dark, quite firm, wax appearing in basin!
Sometimes I have to repeat a few times over an evening, but then I can hear everything crystal clearly again.