A clear voice starts before software processing. If a mic sounds distant or harsh, identify the cause with a short test rather than stacking filters at random.
Record 20 seconds in the app you normally use. Speak at a normal volume. Note whether the problem is hiss, echo, clipping, plosives, low volume or interruptions. Save that recording so you can compare each change.
A noise suppressor can help with steady background sound, but strong settings may cut off quiet syllables. Compare the result with the original recording. For effects used during calls, continue with real-time audio basics. For recorded content, use the YouTube recording checklist.
Quick checklist: Mic selected correctly; suitable distance; gain does not clip; room noise reduced; headphone playback checked; final app tested.