The only mostly permanent option I’ve heard about is a surgery where they snip some of the ligiments where your dick attaches to your pelvis.
It’s mostly permanent because sometimes the ligaments can heal themselves, reversing the results.
In occasion, snipping the ligaments can cause the penis to retract and get even smaller.
But some claims of up to 3” in length can be had all just depends on the person.
For enhancing girth, most any of the regular PE things you’ll find here will add some girth. Over the years I’ve done jelqing, and pumping. And they are like any other “workout” routine. As long as you do it and maintain it, you’ll see some results. I don’t know if my erect state has ever gotten longer, but when I’m in a good routine, my flaccid state is certainly more impressive. I have noticed increased girth both flaccid and hard. I also tend to just feel better about my cock when I’m in a good routine.