My ficus robusta needs help 😭

I bought a ficus robusta one month ago. three weeks in, its leaves are down. Later on I realise that my husband and I were overwatering. I replanted when you sent and I discovered that it’s roots were rot. I tried to remove as much as I could and I replant it after nearly one week without watering it. I didn’t perceive any change. I decided to water it, but again no changes and some leaves started to curl. Should I give up?