You can also change the model you were using.

e.g.
If it was a flat fee on the front end and an oto, change the front end to
$1 trial for 7 days, high priced upsell, low priced downsell, add somem ore
stuff to it.

I would try to make the sales page look as different as possible. You
are still 'relaunching' but the difference in model and site will make it
look new and can possibly be whats necessary to get previous jv partners
to promote again.

IMO