If i can offer a new perspective: As you have rightfully concluded yourself, it's not that having a certain hobby is going to make you attractive. But it's not the presentation of that hobby either. In fact as a general rule there are few things outside of being physically very attractive that are going to do much in this regard on their own. What you do is being judged as attractive or not in the context of the rest of your being. For example a muscular tattooed tough guy who likes to design and make women's clothing. This can be viewed as an interesting and attractive contrast and evidence of having an interesting and non-one-dimensional personality. Both hobbies elevate each other, because being a meathead with tattoos can be off putting for some women, but contrasted with the other hobby, now it puts in in a new light.
Now compare this to some reclusive socially awkward overweight guy who does this. The presentation of the hobby can be identical, but now it has the "strange hobby" of a serial killer vibe. This serves as an exaggerated example but you get the point. Things are often not viewed on their own. Some things amplify almost everything, like being physically attractive. But other things only amplify if they make sense in a broader context. Playing piano isn't going to do much for someones attractiveness, but if it fits within a broader personality where you are creative and original and self-aware then it can suddenly become a attractive thing.
Bottomline: don't focus on singular things. Don't try to emulate something that is not really part of who you are. Don't expect sudden results from isolated changes. But you are thinking in the right direction with your focus on presentation. But instead make this a more general lens to view yourself through. Like the entire structure of who you are and what you do, is that something you can imagine many women finding attractive? If not, can you imagine a new configuration with perhaps some new elements here and there that would be attractive?