I would suggest you focus a lot on the design, research the history and design of other languages. Try to understand how they evolved and try to figure out thei

I would suggest you focus a lot on the design, research the history and design of other languages. Try to understand how they evolved and try to figure out their bad decisions on the way. Eg. Pythons PEP, PHP’s RFC, Mailinglists Building the language itself is the easy part...