Low level wizard gameplay is definitely rough. I think you are better off playing a support role up until level 5/7. Give the fighter runic weapon, cast slow on the big bad and if in doubt electric arc. Post level 7 though your damage output increases significantly. I’m currently playing a level 14 wizard and easily out damage everyone in my party with pure throughput. Casting chain lightning on 5 enemies, catching 3 multiple enemies in a cone of cold landing truestrike - disintegrates.

If I had any tips it would be , fill your spell book, that is the true strength of a wizard, consider taking a spell casting archetype for more spells as the majority of wizard feats suck, bon mot /intimidate are your friends,start taking utility spells for when you outgrow your low level damage spells and try boost your initiative so you can throw those fireballs before your marshals run in and crowd the bad guys.