Grab Metal Skin if dying too fast during ult Armors if you need more resist Cooldown and Duration is preference Silence glyph if you cant wait until Curse.
Phantom if need more engage or need to single out a carry Curse for Seven, Haze, etc Diviners Kevlar for survivability during Singularity The rest is extra If running low on flex spots sell basic mag, healing rites, healing booster.
This Dynamo build features decent damage balanced with good utility, engage, and survivability. Overall solid build for learning the character and understanding Dynamo's strengths as an engager for the team fight or for picking off the carries.