We can enlarge people, so how about we just empower weapons as well?
Casting Time: 1 action
Range: 30 feet
Components: V, S, M (a pinch of powdered steel)
Duration: Concentration, up to 1 minute
You fill an in range target’s weapon with raw power for the duration. The weapon deals much more damage on a successful attack that it normally would. The weapons damage increases by one step up this dice chain from its normal damage-1d3-1d4-1d6-1d8-1d10-1d12/2d6-2d8-2d10-4d6-4d8-4d10. This damage does not count as magical unless the weapon was already magic and is of the same type as the weapon usually deals.
At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the weapon’s damage increases by one additional step each slot level above 2nd.