Here’s what I have gathered, and already tried and I am supporting it after one set, and about to do another:
Stretching, or in my case hanging with a fulcrum to form a v-stretch. I use a pvc pipe in the middle of my penis and I attach my hanger in a way that it pulls up (pulley hanging from an S hook off my desk.)
After doing that I was more elongated in my static stretcher which I now use after every set.
Also erect bends are supposedly good from other members who had this, and they gained lots of length from it. Obviously they bend against their upward curve and tight spot, so they bend it back, or down (away from you) depending on how you want to look at it.