What is the voltage between Vin & GND?
The voltage on Vin when you power that board thru USB is not relevant ... Vin is not the pin you are looking for

You clearly have a Lolin NodeMCU (V3) board - the existence of Gnd and VU (looks like VV in your picture!!) between A0 and S3 pins indicates that

In documentaion easily found by searching for Lolin V3 pinout - VU is described a USB power output



Use this pin to connect to JD-VCC on the relays

I've just now successfully done this with a 4 relay board

I would connect (nodemcu -> relay)


3V3 to VCC
VU to JD-VCC
Gnd to Gnd
Dn to INm - i.e. choose a D pin on the NodeMCU and connect to an IN pin on the relay