Help with Atmega32u4 custom PCB
220 Ohms, if your schematic represents what you have on the board is too high.  You should be using ~22 Ohm for USB 2.0 edit: As noted by below, your schematic is correct here, just interesting notation and I misread.

It looks like you are basing this off of https://github.com/Dr-Derivative/Goldfish/blob/master/doc/goldfish.pdf

You should examine the key differences here.  Notably:


CC1/CC2 are not terminated
You have unconnected VBus lines on your connector
You have unconnected D-/D+ lines on your connector
Your ATMega is insufficiently bypassed by capacitors on the power input.


The CC1/CC2 not being terminated is the biggest issue.  The CC lines are how USB-C determines connectivity and orientation.  Without them, your system won't attach as it doesn't know which way you've inserted the connector.