Head girth tricks I’ve used…
ULI #3. Especially if you relax the grip a touch to kegels more blood in as you move upward.
Pumping with a silicone sleeve. It adds stress on the head.
Jelqing or ULI#3 with a rubber band or condom base ring beneath the glans. This trick isn’t comfortable but does work and requires dry hands to get this condom ring off. It constricts blood flow so forcing it engorges the glans longer and to a greater potential degree. This was my first glans technique. Only do it for 5-10 mins at a time then take a break.
Sadsak Slinky works well too.