Timing is everything on kelvin. Use beam to catch enemies in open LoS. Kelvin has high base damage so play off cds and use your weapon to thin waves. Use dome to trap 1v2s and split fights around key enemy and teammate CDS this takes awareness and premeditation.
Playstyle centered around using wave prio > steal boxes/camps > roam for stacks on TC > take objectives.
Max beam and max ult by mid game gives crazy teamfight potential and skirmish power.