I'm not sure what your specific physical issues are, but I wear AFOs on both legs that are very similar to the one you wear (though mine are a different brand). I wear them because of Charcot-Marie-Tooth disease, which is an inherited peripheral neuropathy that causes muscular atrophy in the feet, ankles, and calves. I pretty much need them 100% of the time to walk semi-normally and without falling. I've also had some wear issues with this type of AFO, and I'm now on my third pair in about 5 years. My understanding is that breakdown of the material is basically inevitable with heavy use, though certain activities can certainly speed it up (jumping, maybe cycling, stepping on stairs improperly, etc). So you may just have to accept that they don't last forever, and that wear may be accelerated if you are very active. If you're having to pay for them, that's not fun, I know.
I started out wearing my AFOs while cycling, using large BMX-style platform pedals, when I restarted cycling as an adult (my disease didn't affect my muscles significantly until young adulthood). The AFOs can certainly give you more power on the downstroke, and help to prevent your weak feet and ankles from causing your feet to slip off the pedals. I've transitioned about 2 years ago to using clipless pedals with no AFOs, and find that this actually works quite well for me because they hold my atrophied feet in the correct position without the need for a rigid orthotic device. I do have custom-made orthotic foot inserts for my shoes, that are designed to accommodate my unusual foot anatomy (extremely high arches) while being quite rigid so that lots of power transfers. It did take me some effort to get used to this, but now I'm more mobile and stable on the bike than on my feet. I have no idea whether this would be a possibility for you, but you might try discussing what you want to do with your prosthetics/orthotics professional. They might be able to find a solution that would work better for you than what you're doing. But without knowing more about your specific physical issues, it would be hard to say.