I'm thinking what title match what I actually do. My current title is Product Designer but I do more Brand Design lately (marketing website) My favorite part of work is Visual Design, embracing the brand essence to product. How about these? Product Art Director Visual Designer

I don't have a good answer to this but I would think about it in terms of how you want to present/market yourself.. Is there a reason why "Brand Designer" wouldn't suffice?

Yeah, how I want to present myself is a good perspective! The fact current job market is totally split Product and Brand design but I honestly want to do and can do both. So I feel "Brand Designer" isn’t good enough or lacks my strength.

You could do a combo title like "Product and Brand Designer" but ultimately when it comes to a job you apply for, you might be forced to "pick a lane". There are jobs that ~want it all~ but sometimes means actually doing the job of 3 people lol