You mentioned all the most common methods pumps and implants. Something you could try is to trim the hair around the base which would make you look bigger.
This is true I read this before but I can find the link. Men increased the size of the dicks by 1-3 inches using a U bike lock. It requires you to be standing most of the day you tie the lock around your guy and the weight strecthes the skin and makes you bigger. You have to do this for more the 6 weeks and some men experience pain during sex so it might not be worth it.