Once you get Impulse ( morph it into Pulsar ) use it with Lightning Splash and you can easily grind mobs to gain levels quicker if you get bored of doing all the quests, aslong as you follow the main lines you can skip whatever else you want, I got sick of questing and ended up just farming mobs lol. Pulsar lowers nearly any enemies health by 10% including bosses ( unless they've changed that ), so you just get on top of the boss and cast that at least once before anything else and it will take 10% of his health off instantly, which can be huge in damage terms, drop a Lightning Splash straight after to do further AOE damage whilst you retreat to get to shooting distance.
It does require higher level Destruction Staff to use Impulse*Pulsar* but you can grind weapon levels quicker by having a macro hotkey bar that contains all the Destruction staff skills, when you go to turn in a quest you use the macro to put all of your Destruction staff skills onto your hotkey bar and because they all have their own individual EXP as a skill they gain from your quest completions, your Destruction Staff also levels from their gains, with all available destruction staff skills slotted you can level up your Staff a lot quicker. Clannfear is great for soloing quests/bosses but TBH I never needed Twilight Matriarch.
I never used Restoration Staff as I was leveling 2H and I never really had much trouble either, just the occasional potion. In fact defeating Molag Bal I think I did mainly with light attacks, I used bolt escape modestly ( or ball of lightning ) to dodge and just blast him with light attacks, it was pretty fucking easy tbh lol, once his health got to the 20% mark I used the occasional Endless Fury for the bonus damage on low HP enemies and he soon died.
Your stats now won't reflect on what you need them to be later in the game, their needs change consistently throughout the game and you can use items to pad out your stats in the higher VR levels. I think I currently have my Magicka at 20, it could be lower, and my Health must be over 30 now at VR3. Don't have anything in Stamina and don't have many boosts for it as I only really use a couple of Stamina based skills ( get decent melee damage bonuses from my current armour set and skills/spells ). In Cyrodiil with food my health is probably atleast 22k and my Magicka is over 19k, at least from what I remember haven't played much been playing Total War Arena lol. Stamina's a modest 9k. Magicka regen is one of the main enchantments I have on a lot of my equipment, it is vital in combat as a Sorcerer as you'll easily blast through it for Offense and Defensive spells so you need to be able to regenerate it quickly.
You'll find a lot of min maxing in the game and some really insane builds, my build was inspired by another early on in the game but I adapted it and changed it how I saw fit, I can do really well with it and I have a lot of fun so I'm not bothered if I'm not "hitting max DPS levels bruh" lol.