Should I start a new but harder game?

I've spent 200 hours on this game since getting it in June and I've have been hooked ever since. I've gotten the fighting mechanics down and as well as the crafting side of things.

I've moved on from low zombie pop to apocalypse but still don't find it as challenging. In the easier mode I've cleared all of Rosewood POIs before the update. Currently in Riverside and have understood most of the skill grind.

Question is should I restart on a Harder settings now or should I stick to this save until I at least clear Riverside POIs then I was thinking of starting in Ekron.