Relactation

I gave birth August 2019, at first I was all for breast feeding my baby but it was very hard. It was hard for me to get sleep, latching, find time to pump etc... so I stopped. Recently I’ve been feeling really guilty for only giving him formula & id really love to start breastfeeding him exclusively. I squeezed my nipple & I do see that milk comes out (but barley) any moms have any tips/tricks/remedies to get my milk flowing again?

(I just pumped for an hour & it was veryyyy little to nothing but something did come out & it was very yellow)