My partner brought a bonsai home last fall, we're not sure of the type, we think it could be ligustrum (privet) or barbados cherry. Recently our plant has started to wither and we find it really difficult to figure out our next step, as this is our first bonsai we've been reading a lot of guidance from books how to revive our plant, and we are thinking of root punting soon as we think the roots might be rotten. but we not sure what the best soil would be to use ? I also read about not fertilising bonsai's until they get better ? We would appreciate any kind of help. thank you.