This is going to sound nonsensical for a moment, but hear me out.

The best way to develop a style is to spend a ton of money and time buying a whole ton of clothes without referencing external media too much. You are going to make mistakes, and you'll probably lose a little bit of money along the way, and you may or may not have a couple of sleepless nights hunting down the perfect obscure Helmut Lang jacket made once in 1999 in a certain colorway and in a certain fabrication, but the only way to hone any skill in the real world is to put something real (money and time) on the line and make a couple of mistakes along the way.

If all you do is make picture galleries of other people wearing clothes you think are cool, you'll end up trying to copy their styles, which may or may not jive with your body/lifestyle/personality/whatever. There isnt anything wrong with copying other peoples styles, but you sort of have to let your own sense develop organically and not let it be short-circuited by other peoples styling, especially when you dont have deep insight into their life/lifestyle (I may love Rick Owens, but if I work in investment banking, I probably shouldn't go full Rick right away without securing a decent work wardrobe).

With regards to money, you don't particularly need a designer budget to develop style, but you do need a decent amount of disposable income or deal-finding patience and an awareness of how the resale market works for whatever item you want if you dont want it to get out of control. If you are careful and buy strictly used/on sale, you can dip your toes in most styles.

Ive oscillated from hardcore UNIQLO erryding all-day erry-day, to scandiminimalist APC-Acne-Norse Projects (back when you could reasonably describe them as minimalist), to avant garde Rick Owens-L0-CCP-Yohji-CdG-Rosenrot back to normal-with-a-twist Pas de Calais-Margiela-Dries van Noten.

My advice would be to just take the plunge. Buy the things that fill out what you need first, then start buying the fancy stuff. Be aware of how much you are spending and what you can get back from the pieces you buy, and just try everything on. Remember this is supposed to be a fun hobby, so dont treat it like some kind of bloodsport!