I had noises twice the past month.
One was a tink tink tink while pedaling. Thought it was the bottom bracket. Turned out it was the seat rails seatpost contact area. Took apart the seatpost and applied grease everywhere metal surafaces touch. Noise gone. Does the noise happen when you pedal out of the saddle?\

Second noise was the bottom bracket. Sounded like a metal snap or knocking. Replaced the old cup and cone one with a UN54 sealed last weekend and no more noise.

Anther time is was the rear wheel. Increased tension on all the spokes and it went away. There are a lot of possibilities.