Do I have hope? How to move on from here?

Little bit more detail please
Sure. Started showing signs of rust on leaves, now dark spots have taken over leaves after I moved it outside. Have ruled out bugs. Feeding Biobizz line of nutrients with PH'ed water but for past 3 days and continuing later this week just allowing the rain to water it.
 
Ph of water has ranged between 6.2 and 7.2 I would say each time I have checked. Mainly using tap water that has sat out over 24 hours but last few days have been just rain.
What is the PH? And yeah you can bounce back from this for sure.
 
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