well considering on this page it is considered "a ficus is great for beginners"...
An untrained (or a properly pre-trained) ficus, sure. Your ficus not so much. As LB said, it's not the species that makes a bonsai.
This for example is also a ficus - and absolutely no longer useful for bonsai.
(some may argue it can be cut down/rebuilt, but that's not really realistic)