For Covid Mask #2, I complained that the top straps were too wide and that they wouldn’t stay above my ears:

The thin tie at the bottom works well, but thick tie at the top is too wide and does not fit comfortably over my ear.
I replaced the top tie with a thinner self-fabric tie quite some time ago, and I sewed a place to put a wire stiffener over the nose (having given up on getting the 3D-printed nose clips to be reliable). I’m using 22-gauge copper wire (with insulator) in a triple thickness to get something that has the right stiffness and malleability.
The mask sort of worked with the thinner ties and the nose wire, but even the narrow ties would not stay in place over my ears and got quite uncomfortable after a while. I also had trouble keeping my glasses from fogging, despite the nose wire. I had stopped wearing this mask, relying just on my first COVID mask.
Last week I had an idea on how to make the mask work better—instead of trying to keep the upper tie above my ears, I tied it below my ears:

The low tie also pulls the nose wire firmly against my nose, and I’ve been able to walk or bicycle for 45 minutes without my glasses fogging and without needing to fiddle with the mask.
The change in how I wear the mask has changed this mask to being my favorite, though I still plan to make or buy some more, as having only two masks means that I sometimes don’t have one that has been laundered since the previous wearing.
[The astute reader will notice that my beard is much greyer in the newer photos—I’ve not been dying my beard this summer, and all the dye has either washed out or the dyed hair been trimmed off. The colors now are the natural colors of my hair.]