can someone confirm that the blue wire is the "C wire"? What are the other wires (yellow, light pink, brown, and orange) that are not connected to anything?
R and C are your power wires. W is for heat and G is for fan. Cables come with multiple wires in the bundle. The rest are just extra for future use like if you added air conditioning you would use the yellow wire usually. Orange if you were to add a heat pump and so on. Or if one of the wires were to break you could use one of the other ones.
From the information you provided, it's not possible to determine if blue is actually your C wire.
Does your thermostat turn on with the wiring in that place? If yes, then it could be Red or Blue are your C wire.
Assigning you know the G or green is actually your fan wire you can test the other wires for R. The fan should only turn on when you touch G to R. G to C should produce no fan sound (but the same thing would happens with G to W, or if either wire was shorted or disconnected elsewhere).