Crossbow Fighter (PC formerly known as a switch hitter)

[Expected]

What are your thoughts on allocating ability scores/taking feats to support different fighting styles (e.g. melee/ranged)? I plan to play this character at range until (or if) I get a Str magic item (Belt of Giant's Strength). It's beneficial for a few reasons. I will have a viable method to attack flying enemies (and can Trip Attack them and then run up and attack with advantage), I won't waste turns being out of range to attack due to 30ft speed (I can drop my halberd and pull out my hand crossbow), and I'll have a high Dex for skills/initiative/saving throws (synergizes well with Indomitable). This is my proposed build:

Variant Human
Battle Master Fighter
Hand Crossbow/Halberd
Light Armor
Str-Dex-Con-Int-Wis-Cha
8-16-16-8-15-8

Crossbow Expert [Level 1], Sharpshooter [Level 4], +2 Dex [Level 6], +2 Dex [Level 8], Polearm Master [Level 12], Great Weapon Master [Level 14], Sentinel [Level 16], Resilient: Wisdom (+1 Wis) [Level 19]

Any advice and/or criticism is welcome.