Relactation

Does anyone have any advice on how to get my milk back? My baby is 3 months old, I breastfed her the first month & 1/2 but I was not producing enough. She kept getting frustrated & would throw a fit lol. She’s been formula fed for a while now but I got us out of the bath & sat down with her and she tried latching on. I was also doing tummy time with her laying on me and it was like she was sliding her body to where her head was on my breast. If I hand express I can still get a drop or so of milk out. I’m getting a new pump, my old ones sucked (I had 2 different brands). The flanges never fit right & I just didn’t have the money to get different ones, or the suction was weak. Any advice would be greatly appreciated. I miss breastfeeding so much , at 37 weeks pregnant I had Covid so I really want my daughter to get those antibodies while they’re building up.