If you have to wear a black ear loop, and you want Amazon, then look for double sided "fashion," wig, toupee, or medical tape to go along with KF94, KN95, or FFP2. See here:

https://www.pnas.org/doi/full/10.1073/pnas.2110117118#fig02

The best mask fit, that is, least leakage, is found in case iv, in which the face seal leakage at the nose is eliminated by using double-sided adhesive tape 3M-1509 as explained in Total inward leakage.

Example product for double sided internal mask tape on Amazon:

https://www.amazon.com/Pro-Self-adhering-friendly-resistant-reposition/dp/B08CJWDDS8

Also consider the "Fix the Mask" or DIY external mask brace, and you should be able to get a much higher fit factor with either or both of these. A DIY 3d Print could be painted black, or use electric tape, what have you.

https://masks4all.co/#mask-brace-mask-fitter

https://fixthemask.medium.com/fix-the-mask-data-the-essential-mask-brace-ad5bdf33f506
https://www.fixthemask.com/products/2-pack

https://www.amazon.com/dp/B08CJWDDS8?psc=1&ref=ppx\_yo2ov\_dt\_b\_product\_details

I recently bought this double sided tape and it’s very strong. Like a very sticky bandaid. Not sure how long it lasts yet, but I was able to take it off and stick on again at least once.