Repurposing a Nano

Hello, I have made a custom board for a rocket altimeter and decided to just take the 328p off of an old nano to not have to buy a new one. With the goal being to make the board as small as possible, I decided to use an external USB to serial adapter (CP2102). I assembled it all yesterday but when I try to program it I get

avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xcf

I tried to burn the pro mini bootloader but it is still not working, any tips? Thanks

Can you post the schematic for your custom board?

yaboikillerkeemstar:
I tried to burn the pro mini bootloader but it is still not working

Was the “Burn Bootloader” process successful?

pert:
Can you post the schematic for your custom board?
Was the "Burn Bootloader" process successful?

Yes, it said it completed, I used an uno to do it

Have you performed a loop-back test on the CP2102?

Does the board get a reset pulse from the usb-to-ttl adaptor?