I find myself guilty of the Moncada roller coaster too. Get too high when he does well, and get too low when he doesnt.
I try and force myself to remember... what he does in 2018 doesnt matter. If he hits .300 this year, that doesnt mean he's going to hit .300 when we need him to. (2019, 2020, 2021, etc) Guys get better or worse over time.
What's important now, is that he learns and improves month by month. So then when it really matters/counts, he's a reliable player,