Congratulations!
We have two 2019’s. We put on larger seats and seat post shocks. Wife has the rear basket on hers. Usually have to tighten all spokes a half turn then again around 2500 miles. Check the torque on the rear wheel nuts. 18mm wrench. Don’t use the cheap one it came with, too loose and too short. Learn how to adjust the brakes.
Let us know if you are able to bump it to 25mph, some are saying it lets you do it on the 2020 but it won’t actually work.