If you're still in the market for advice, I got you, fam!
Liberators are disappointing like you wouldn't believe. They're a tax at worst and a teleporting objective grabber at best. If you have to use them to finish your battleline, go for it, but they're far and away the worst option for stormcast battleline! Judicators, Sequitors (With lord arcanum as general), and Vanguard-hunters (With lord aquilor as general) are all more expensive point wise, but something you can actually count on as part of your army.
Vandus Hammerhand is a Hammers of Sigmar named hero, so if you aren't running the HoS stormhost, he should just count as Lord Celestant on Dracoth. HoS stormhost is incredibly underwhelming. You really only take it for Gavriel Sureheart's +3 to charge command ability. It's super disappointing!!
Evocators are amazing and got a point increase to nerf them, but they'll still trash everything they get into combat (and attack first) against.
If you have the ability to change your fulminators and tempestors into concussors, they're the dracothian guard that I would recommend personally. A Celestant on dracoth with staunch defender running up the line with 4-6 concussors buffed by a lord castellant is going to just humiliate anything that can't do more than 4-5 mortal wounds a turn.