uuhhhhh underfed maybe ????? and now that it doesnt have any energy its over watered.
You want to bring it back feed it some veg nutes add epsom salt add microbes some kelp wouldnt hurt either, at about 400 ppms and then foliar feed it some veg nutes one day at 200 ppms and epsom salt at 150 ppms the next day repeat till it gets better.
You in the great lakes root zone too cold
#1 issue lack of mag
#2 Issue lack of nitrogern