How much would you spend on a new wardrobe?

I’ve had the realization that none of my clothes really fit me and I look grossly undressed in most places besides going out to hike. So I need to invest in a few outfits for work, errands, going out, dates, social events, etc. What would you focus on the most for building a proper wardrobe? Where would you shop? I used to love Loft and Ann Taylor when I worked there after college. Fashion Nova has some decent stuff. I’ve been buying a few pieces from SHEIN but where else can I go? What do y’all recommend?

EDIT: I wanted to add that I’m almost 30, I’m short. I’m petite plus at 5’2” 185 pounds. I’m more of an hourglass shape. I live in SE USA, so it’s rather hot and humid for a good part of the year. I work in an office but it’s not formal like an attorney’s office but more business casual. I’ve recently bought a stuff from PINK, Old Navy, Free People, Walmart, and Target. I’m budget conscious as well, hence the SHEIN.