Keep a list of things you want to add on once the core is done. Be ruthless about putting things on that list instead of into the product. The more exciting ite

Keep a list of things you want to add on once the core is done. Be ruthless about putting things on that list instead of into the product. The more exciting items you have on that list, the better motivated you'll be to put other items on that list instead of directly into the product so that you can finish the core product sooner and get to the fun features.