I'm just throwing out a suggestion or two. When you have water in your on-board tank, and then double check that you do have the water pump switch turned on at the control panel, check a couple of things.
When you turn on the water pump switch, does it light up? This is only part of the circuit for the pump to work. The switch could still be working but the lamp in the switch is burnt out.
Secondly, when you open any of the taps.......kitchen or bathroom, listen carefully. You should hear the pump running as it builds pressure to pump the water. It should also make a sound when you flush the toilet, but it may be harder to hear.
Here's hoping.
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Ken and Terry
2018 Sunseeker 2430S-CD, nicely modified and carried by a 2017 Ford E450 Sport
Former Georgetown 330TS owner for 10 years with more mods than I can count, pushed by our 2017 GMC Terrain