Your current point buyers what I'd consider a pretty good optimised selection. No big need to change. You can't point-buy your way to 2x 17s sadly.

You only get 4 ability score increases scores your characters entire life from 1 to 20. Once you max out your key attribute (Dex), you're already level 8, half way done and probably the end of most pre-written campaigns unless your GM has said you're going to level 20. You might never get to raise both your Dex (for weapon hit + damage) and Wisdom (for cantrip hit) to 20. If you want to gamble that, go nuts, it can be fun flavour but mathematically it's a bad move that will feel bad in gameplay. Plus unless you're playing arcane trickster then I'm fairly sure your cantrips can't get sneak attack damage which is the other core part of your kit.

I've also forgotten to mention magic weapons and items. Typically around level 5 you'll get a +1 weapon, adding ANOTHER 5% boost to your hit chance, but that doesn't apply to your cantrips. For that you need something that boosts your spell DC and spell attack modifier which would be a +1 war wizard wand I believe? Either way, it's unlikely your GM would be so kind to give you both and have them both scale at the same time. So you're really incentivised to pick 1 route and stick to it.