Ca you start again.?

Is there a way to get your milk to reproduce after it dried up.?? My milk dried up after my son got out of the NICU because I glued I wasn’t pumping enough he is now 3 months old and i desperately want and wanted to breastfeed. But my milk dried up slowly from the drive back and forth to and from the hospital all the time . Is there any possible way to make it reproduce, other than getting pregnant again ??!?