Perhaps to be more productive and creative, don’t just stick to 100% arabica coffee. Integrate robusta into it.
Why was I so productive in Vietnam? I think it’s because of robusta coffee. robusta as having more caffeine than arabica.
But why does bias against robusta? I think it’s this “coffeism†thing— almost like the racism of coffee. 
Maybe because arabica is more expensive than robusta, and those people see arabica superior than robusta.
Also, arabica sweeter than robusta. And because modern people don’t like bitter tasting things.
Get a blend of robusta and arabica
What I recommend is this: next time you get a bag of coffee, only buy those which are blended with both arabica and robusta. For example, on our last Trader Joe’s trip, I found this interesting barista espresso blend, which had both robusta and arabica. And when I drink in the morning, it gets me going better than coffee only with 100% arabica.