ONE WAY to increase the pressure is to install a booster pump.
ANOTHER WAY is to increase the size of the main feed pipe to your house. If you have a 3/4″ main feed to your house, you can get higher pressure by increasing it to a 1″ line.
Perhaps we could help more if we knew what you are trying to accomplish by increasing the pressure from 60 to 75 psi. It may be possible to address that target from a different route.