The best way to get better at building things is to build more things from scratch. You're last sentence though suggests that maybe you aren't that interested i

The best way to get better at building things is to build more things from scratch. You're last sentence though suggests that maybe you aren't that interested in getting better at building things and instead you want to get better at shipping product, finding market fit and doing the stuff usually associated with starting a business. If that's the case then building more things probably won't help you. Those skills aren't really engineering related. If you want to be better at shipping product for example, then the best way to do that is to get better at planning and to practice regularly deploying your product. Finding market fit requires a lot of talking to people in your target audience and shipping a product that meets those needs. Essentially, if you want to get better at building things, then simply build more things. if you want to get better at everything else, then step away for your computer, talk to people, make connections, and put your work out there for others to see early and often.