How could I fit in GWM or xbow expert on a sorcerer?

[Randomthom]

I can't make a viable build with 7 sorcerer, but can with 6.

Of the two, I'd grab GWM. You'll want 3 levels of warlock (sorry, I just couldn't do it with 7.) This let's you use a greatsword, and as a bonus medium armor, so can leave dex at 14. Going to want Con at 14 too. Everything else you can get goes to Cha. You'll probably want V. human to pick up GWM.

Now, you only have one attack a turn... normally, but that's not a problem due to sorcerer and a little spell called Green Flame Blade. Learn it well, its now your best friend.

Spam quicken when you can. View your GWM as a resource bonus. Whenever you get a nat 20 (or 19), you don't have to expand that resource.

Its a doable class that does a ton of damage. You never need warlock again.

The main problem is going to be your HP. You're going to be incredibly squishy as a divine soul. I'd recommend Draconic or a UA one if you can get away with it, but this class definitely works as is and you'll be fine.

Offset the squishiness slightly by using a reach weapon from behind someone more sturdy.