I am trying to ask this question as non opinionated as I can. Hard to do with non rules questions which are generally direct. So currently there is a Level 2 Variant Human Wizard of the Necromancy School with the Magic Initiate Feat.
Stats Str 9, Dex 14, Con 16, Int 16, Wis 10, Cha 10 Cantrips: Chill Touch, Ray of Frost, Frostbite (Necromancy/Cold theme) and Magic Initiate gave me Blade Ward, Toll of the Dead (Necromancy) and 1 free casting of Healing Elixir (Alchemist theme) from new level 0 and level 1 playtest spells.
This Wizard has been built as a sort of Alchemist who is only studying Necromancy as a means of stopping, controlling and killing undead as to prevent them from inflicting harm upon the rest of the world. Themes are heavy cold/Ice element with Necromancy mixed in (there isn't much to start with...) and anything that helps play out the alchemist theme.
Taking away Stat requirements which this Wizard may not yet meet for Multiclassing, do any worthwhile AL legal MC options exist for the Necromancy Wizard that help add to, improve, or enhance its Spellcasting options or role as a backline caster? Or, as I suggested, should the Wizard stick to what it is good at and go Full Wizard?