Relactating after a break?

Has anyone ever successfully started breastfeeding again after stopping.

I stopped when my daughter was about 1 month old. Shes 3 months now & I miss it . I feel like i gave up because everyone was pressuring me to come over and bring her over and be here and be there and do this and do that and it made it hard to breastfeed especially with a shield. I tried again off and on when she was 2 months old but she didnt want to breastfeed. Now shes 3 months and not doing that great on formula so I want to at least pump and feed her. Any tips?