Originally Posted by
Wri-El
Superman could even study kryptonite, and its very isotopes, and for example create serums or out of them. Here's an example... We know that red kryptonite can cause temporary mutations in kryptonian DNA, and that with blue kryptonite (Pre-Flashpoint) that seemingly had no effects in normal kryptonians, had the same effect on Bizarro that green had on Superman, while green on Bizarro made him more powerful.
So we could have Superman arrive at the conclusion that Blue Kryptonite if energized could increase a kryptonian powers, but only temporarily.
So he creates a serum or a sunstone crystal infused with the energies of red and blue kryptonite, in such a way that if Superman was to bathe in the energy of the sun at its surface or by sun dipping, and when Superman returned, his powers would've been permanently increased.
Basically the serum or suntone crystal, create a temporary boost to his kryptonian DNA, making him able to permanently increase his powers and/or even gain new powers.
Another example. Create a sort of helmet or head device, that connected his brain to the Fortress AI systems, and then run mental exercises meant to increase Superman ability to use his super brain in combat, help him simply control his powers better or even develop new one's.