Harder erection exercises or techniques

Are there any exercises to getting a permanently harder erection?

I know jelqing and kegels will help but any other ways?

Edging

From reports here over the years, a sensible and regular program of PE usually results in better erection quality. The routine you choose is up to you. Point is, whatever method(s) you choose shouldn’t tire you out or cause you any injury. A sensible PE program does not include pain.