Little Help

TBH, these things are just a waste of money for the most part but I don't have much experience.

Checking your camera specs you already have a crazy long zoom range so I doubt adding any kind of teleconverter will be at all feasible. Admittedly you might want to go wider, but this you can achieve by stiching and get a better result.
 
That might be a better option, a Circular polariser make a big difference and is used in 90% of my outdoor photos, maybe 95%! A ND filter can allow some long exposure which are usually good for flowing water.
 
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