Duelist Slayer Build Feedback

Good day!

The most fun I have in Path of Exile is trying to come up with builds myself. The massive amount of possibilities is what draws me to this great game. I am wondering if this is the place to ask for feedback for a build I made? If not my apologies for spamming.

This is the current of my character (PoB paste): https://pastebin.com/6H6uGVBx

I use Double Strike for single target and Cyclone for AoE. Another thing I was wondering is if I should just focus on one single skill for all situations or if it's a nice idea to also have a "boss killer" single target? I can generally clear tier 10 maps without dying but sometimes I do get wrecked.

Anyway, any advice and feedback from more skilled players is greatly appreciated. Always want to learn more to make better and better builds.