Usually, acrylic varnish dries pretty quickly. However, I varnished some oil paintings with a varnish that was suitable for acrylics and oils, and it was sticky for longer than a week.
My only suggestion would be to wait and let it dry. It will dry at some point.
You may be able to accelerate the drying time a bit by keeping it in a warm (not humid) environment, or by using a hairdryer, but I would not touch the varnish or try to remove it while sticky.