Rescue young grape vine in container

Hello! I have a young grape vine I purchased from the nurseries a few weeks ago. When I potted it, I hadn't realised the drain holes were bunged, and as a result, the soil got waterlogged, and the leaves starting curling on the vine - it's this that alerted me to the problem. I repotted, added some broken pottery etc at the bottom and a much finer soil/compost mix. Anybody got any further advice (as I am very, very far from being a knowledgeable gardener). Appreciate any thoughts... Thanks!