I think learning a language. Specifically Chinese as it is the language with the most native speakers on the planet. There is nothing really stopping me from doing this so I don't know what kind of magic would help me focus on this task.
I started DuoLingo a couple of years ago and slowly started learning German just for fun. It’s like 5-15 minutes a day and I’ve gotten decent at the language without a whole lot of effort. It’s no Rosetta Stone but they keep it fun and interesting.
Social skills, fashion and getting better at programming.
I think I have ok social skills but I'd like to hone them and be more outgoing. Ideally I would like to be comfortable talking to new people in any group setting.
Fashion - sweat pants and a t shirt is comfy but it isn't cutting it anymore. Every time I search men's fashion I get rich guys wearing shirts that are to small.
Totally depends on your age and style, but check out streetwear communities. Its super flashy but the basics of proportions and colours can be applied to any casual outfit.
Get some jeans that fit and some neutral (not graphic) t-shirts and you'll be ahead of a lot of people.