Minimize the number of devices using the water system at the same time. For example, if the system powers a sprinkler system, lessen the number of sprinklers in use simultaneously. The fewer sprinklers in use, the more pressure each sprinkler head has. The system only sustains a certain amount of pressure at one time.
Turn up the pressure switch on your water pump to maximize the pressure available. Pumps are often set at a lower pressure when initially installed to lessen wear and tear on the pump so it lasts longer. Increasing the setting does put more strain on the pump, but the increase in water pressure often makes the added strain worth it. Turn off the water pump and take the cap off of the switch with a screwdriver. Turn the bolt on the tall post under the cap clockwise using a wrench. One full turn usually increases water pressure by about 2 pounds.
Install a booster pump to the water system. Booster pumps, as the name suggests, are specifically designed to increase pressure in a water system. Turn off the main water valve and connect the water line into the booster pump after the main valve. Connect the output of the pump to a water pressure tank and the output of the tank to the water pipes.