Founders, if you could go back 5 years. What would you do differently?

I think I do a fair job to capture this here - https://medium.com/@nubikay/7-le...

5 years ago I started my first business in dropshipping while in high school. I think it was a very valuable learning experience and also helped me get into university when I wrote it on my essay, so I wouldn't change too much what I did even though it wasn't a success. Overall, I would focus more on promoting the product rather than fussing over small details such as font color or when I posted promos on social media. I would also do more bootstrapping rather than spending money on marketing services I didn't understand too well. If you went back 5 years, what would you have done differently Odun?