Wait for Potential Apple Pencil Support
At one point it looked like the 2018 iPhone models would get Apple Pencil support.
TrendForce claimed Apple would be bringing Apple Pencil support to the 2018 iPhone models. Taiwanese publication Economic Daily News also claimed Apple would pair the Apple Pencil with the 5.8-inch iPhone and 6.5-inch model. That obviously didn't happen, but that doesn't mean the rumors are dead in the water.
A report from Citi Research lists Apple Pencil support among the features coming to the 2019 iPhone models so the door is certainly open.