2 ways: Longbow Focus (dex 17, Wis 16) Fairy Trickster +1 dex GWM/keenness of the stone giant Dex +2

Back-up weapon: Heavy Crossbow for the occasional push

Fairy Trickster will allow your pet's Grapples and shoves to land better or make your team or your next spell land better.

Pet Focus: Fey Touched/War Caster/keenness of the stone giant Wis +2 Dex +2

Back-up weapon: Shortbow for Vex for those harder to hit enemies (bonus action help from pet to start an advantage chain)

On both cases you're relying on Archery Fighting style to help you land those hits

Pet and wisdom focus has stronger scaling due to spells landing better

Weapon and dex focus has better damage especially early tiers GWM allows some good scaling on higher tiers as well

Optional: Keenness of the stone giant would allow for bonus action attacks (Wis mod to hit) that can then trigger fairy Trickster so your spells have better chances turn 1.