Notice the sidebar of this blog. It has a list of ideas for ministering. The first suggestion is to visit. To be clear, a visit is always a good idea. There's nothing like talking to someone face to face to get to know them and learn to love them.
These other ideas can be sprinkled in along with personal visits. We are on the Lord's errand as we minister to others and our Savior will help us to know what our sisters need if we listen to Him.
Having said this, do your ministering sisters a favor and make yourself available to them! Please don't ignore their texts and calls and efforts to get to know you. They are trying to do what our prophet and Savior has asked them to do - which is to love you.