[Beginner] Hit a wall with my endgame build
Hello! This is my first ARPG so I'm a complete beginner to the genre. I've been doing Witchunter Grenadier build as my first character (I know it's off meta) which has served me quite well until now that I've reached T15 maps. While I can semi-reliably do most maps, my clear speed is rather slow for juiced maps, and in longer boss fights mana is a problem. The gear I'm dropping/crafting always seems to fall short in one key stat, so I haven’t felt much progress lately. [Here's my POE2Ninja link](https://poe2.ninja/profile/FameIch-2479/character/Dreiudin). Do you have any suggestions as to how can I improve?