Lightning Lure is pretty awful damage, you'd be better off twinning Firebolt, but it can be decent to Quicken it to cast as a bonus action and drag enemies into range of some Twinned melee cantrips that pour on the damage like Greenflame Blade.
If your DM is the sort that likes to use optional rules from the DMG, you can work with him to create new spells using the rules on pages 283-284.
The suggested modifications include adding more targets to spells but reducing the damage die, so you could have Lightning Lure target 2 enemies, but deal only 1d4 damage.
Take something like Greenflame Blade, make it deal Cold damage, and call it Frostblade.
Make Firebolt into Ice Lance by just changing the damage type to cold as well.
It would allow you to stick to a theme if your Sorcerous Origin was Silver Dragon.
There are tradeoffs involved, the same spell damage types would benefit from your Elemental Affinity, but you would be at a disadvantage against enemies immune to your origin's damage type.
