Coming inside should add another threat, not remove the one you already have.
Keep some moments where you hold the width and make the full-back defend the touchline. Then choose times to move inside when the ball, your full-back or the opposition shape gives you a reason. For example, if your full-back overlaps, moving inside can open the lane outside. If the opposition full-back is already narrow, staying wide may stretch them more.
You can also start wide and arrive inside later rather than standing there permanently.
The aim is to make the defender uncertain about where the next action is coming from. If they know you will always stay wide, they can prepare for it. If they know you will always come inside, the same thing happens.
Keep your directness. Use inside movements to make your strongest action harder to predict.
