Is there anyway I can get my milk supply back?

My baby is 4 months old and is formula fed. When she was first born I had a large supply of breast milk and I was leaking like crazy. My shirts would always be soaked from breast milk.. I never really pumped as much as I should have so my breast milk eventually dried up. I can still pump a tiny bit of formula but... show more My baby is 4 months old and is formula fed. When she was first born I had a large supply of breast milk and I was leaking like crazy. My shirts would always be soaked from breast milk.. I never really pumped as much as I should have so my breast milk eventually dried up. I can still pump a tiny bit of formula but definitely not enough to fill a full bottle and probably not enough to fill even an ounce.. is there a way to get more breast milk out so I can pump again?
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