Amplifier for Earphones? (in ears monitor)

Hi! first, english is not my main language, im a complete noob in electronics, i realy like to build mi own in ear earphones amplifier, here is my problem:

3.5mm out from a multifx processor (nux mg30) guitar pedalboard --> to a "custom" earphone (only one earphone "speaker", i recycled only one earphone from a bluethoot set and wired it to a 3.5 mm stereo jack (but it's only 1 earphone so it could be mono)

PROBLEM: master output from multifx controls both volumes: guitar outuput and earphone level.
i need independant earphone volume control, i built a passive one (it's basically a 10k logaritmic pot), but it doen't have enough volume at maximum level, i think i need an active volume control for this (an amplifier)

what's the easy and cheap way out of this? what can i build??
i've read multiple threads here, but i dont seem to find what i need since everyone is talking about "HEADphones" not earphones, i think this may be a major difference

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