If your hot water cylinder is fed from a cold water storage tank then no it wont help it could possibly be slightly worse.
On this type of system the pressure is created by the height of the tank above the outlet position (shower spray) so raising the tank is the answer if that is possible.
The alternatives are fitting a pump (power shower) they are usually quite / very noisy,
an electric shower from the mains, or fitting an unvented cylinder (quite expensive)
Pete