There is no more profitable investment than investing in yourself. It is the best investment you can make; you can never go wrong with it. It is the true way to improve yourself to be the best version of you and lets you be able to best serve those around you.
At the end of your life's journey, what do you want to say you did with your time? There is enough time if you choose to invest it in yourself. Inch by inch, day by day . . . make yourself a priority.