Sorlock

I like having the option to do some fire acuity stuff so I’m including it anyway, but this is another super flexible build that you really can take in whatever direction you want. The one thing that should stay the same between any of the personalized options is that at level 1 you start with sorcerer, for the con save proficiency etc.

If you want to focus mostly on eldritch blasting, the spells you pick otherwise don’t really matter lol. Just make sure at Sorcerer level 2 and 3 you get the metamagic Twinned and Quickened

If you decide that fire acuity is what you want, you can skip the second warlock level (so level 1 sorc1, level 2 warlock1, level 3 sorc2, …. all the way to level 12 sorc11. That second warlock level gives you the eldritch invocations agonizing blast and repelling blast which applies specifically to your eldritch blasts which adds your cha modifier to each damage instance and causes knockback, respectively. Which that is not really needed if you want to stick with FA. In this case you still probably want to raise CHA but it isn’t as important so for the first feat pick Alert instead.