Well done on your improved levels, and keep up the good work!
Yes you can get your levels down to non-diabetic levels with the right diet and/or lifestyle, but that doesn't necessarily guarantee that you'd keep them there if you revert to your previous ways again - your predisposition to diabetes may well always be there - but it can be done. However, for some people controlling their diabetes to that extent has to be a long term or permanent commitment.
Robbity