Change gloves for mire es and resistances
Change off-hand for rathpith "per 100maximum mana" mods if you vhoose mana stacking which i advise to, if noy go for classic one
Change wand for +5 cold spell skills preferably duelist wand to socket living bomb into spellslinger
Change arctic armour and time of need for archmage
Get mind over matter+eldritch battery to stack damage and ehp through mana
Atalui's bloodleting socketed in comet
There are a lot to do to make your build better
https://poe.ninja/poe2/builds/vaal/character/JackieXD1242-3061/Bloodmage_Jackie?i=0&search=name%3DBloodmage_jackie
Here's my pob if you eant some inspiration