This is a tough one and really you figure it out by trial and error.
The leaves have the appearance in the first and fifth pics of possible virus and certainly would explain the plant's "failure to thrive"...However! the other pics do NOT look at all like virus!
Erwinia comes to mind, which is a bacterial infection, when looking at pic 2 and 3. Phyton 27 will kill this (not Physan 20).
AND finally, pic 4 looks a bit like leaf burn from salts and/or fertilizer.
My goodness!!
My approach would be to first check my water source and maybe decrease my fertilizer.
At the same time I would get some Phyton 27 and treat the plant.
Sit tight and see how things go.
Please also make darn sure this is not a creature issue
...get your magnifying spectacles out and make sure you don't have spider mites etc.
If it is creatures, then kill them
The only thing we haven't considered is fungus...if the above does not work, then I would treat with Cleary 3336 which is a great general fungicide.
Hope this helps
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