Did using anti-fungal eardrops not help at all? Clean ur eartips with soap and water and dry them out before wearing. Or sanitize everything, this isn’t common here and I’m from a tropical country too.
Maybe ask the doc if iems would cause this issue and if cleaning it would mitigate the issue. Hearing loss is a serious issue I don’t think u should ask us for advice haha

Spotify Premium is good enough for most people. I’m sure u might have someone around u friends or family who have a high quality streaming plan from Amazon/Apple/Tidal etc check out for urself to see or just play a lossless music file thru ur phone/pc on the Senns via da Qudilex.
I still think Spotify has a good social element to it. IMO music should be fun and enjoyable first but you do you 👍