Silent, ergonomically shaped keyboard on Bluetooth?

Ergonomic seems to mean different things for different people. My personal preference is split ortholinear. If you’d be interesting in a split keyboard check out the pretty extensive list here: https://github.com/diimdeep/awesome-split-keyboards

As for the silent part, if you go for a mechanical keyboard, most will offer an option for linear or tactile switches which will be pretty quiet.

Welcome to the wonderful (and insanely expensive) world of keyboards.