Gun + Heal + Crate

Take advantage of Kelvin's Mobility to take Crate paths and do them well. Don't ignore Troopers. You're playing a game of catch-up, but Gold Idol buffs aren't quantified through Net Worth.
Your gun damage will always hit surprisingly hard.
Take advantage of this and your grenade's heal in lane.
Arctic Beam's damage is nothing compared to gun DPS, but it's a good tool to stop escapes, even at T0.
Use it to keep enemies where you want them while your team supports you.