Meanwhile, I'm paying +55% for a simple PCB because there's no company in America that produces them at small business scales.

Printed Circuit Boards. When I submitted a design for manufacturing two weeks ago it was +45% for a bare board, +55% for assembled boards.

This board has 90 solder points, and I need 500 of them.

+45% to the bare pcb cost and do the 45,000 solder points myself.
or
+55% to the total assembly cost to have them do it.

All costs passed on to me until I can pass them to the consumers.

Qualcomm bought Arduino. I use that IDE, but mostly China made ESP32 modules. Cheap, fast enough, ble + wifi, good lower power capabilities. I'm bougie on breakout boards and use mostly Adafruit from New York. Relatively pricey but well engineered and supported.