Relactation

I breastfed my daughter for 6 weeks and was between formula and breast milk but eventually stopped and she’s currently on formula. She’ll be 4 months in a few days but I would love to go back to breastfeeding her… except, my breast milk is now dried up and I’m not seeing any progress with pumping. I try getting her to latch but it’s not easy as she’s already used to the bottle so she wouldn’t suckle any more than 30 seconds and no more after that. I wasn’t producing much milk during the time I was breastfeeding her and she’d get fussy so I started giving her formula. Has anyone had any luck getting back to breastfeeding or getting baby to latch to produce milk supply again?