I would 2nd the Magic Initiate (Wizard) feat, for Booming Blade. Then, when you can cast 5th level spells, add Holy Weapon, for another 2d8 radiant damage. Between Divine Strike, Booming Blade, and Holy Weapon, a Lvl 14 cleric is dealing an extra 6d8 / 9d8 damage, on top of weapon damage and...