quick PCB review of my prototype dev board

[smarq8]

Hello
I try to build my first 2 layers dev board for my current project. Its based on ESP32, FT2232H bridge (UART+JTAG/SPI), battery powered with some TFT display (not yet included). But before I move forward then I need quick review of my PCB layout. Attached project (eagle) is not yet ended, its missing some less important things like display or sensors.
Especially Im wonder:
1) when I need to cross some hi frequency data lines (2nd screen) then in theory I create some obstacle for return path, so should I add some vias to reduce path, put vias from scrossing line as close as possible to data lines, put via without trace and solder some wire, or leave as it is? I know in this case it might be overengineering but I'm just curious what is more properly solution.
2) as I need to trace 'source' to decouple capacitor on bottom layer then its better to trace it under 'decoupled' line or keep it away from it? (3rd screen)
3) any other tips to improve my pcb?

[thm_w]

Your four vias on the side of the trace looks good, that would be the way to do it.

2) as I need to trace 'source' to decouple capacitor on bottom layer then its better to trace it under 'decoupled' line or keep it away from it? (3rd screen)

I can't see this mattering much at all. You could add a ground via near pin 47 if you do not have one already.