You can always better your best. You don't know what you can do until you try. Nothing will come of nothing. If you don't go out on a limb, you're never going to get the fruit. There is no failure except in no longer trying.
Hazy goals produce hazy results.
Clearly define your goals. Write them down, make a plan for achieving them, set a deadline, visualize the results and go after them. Just don't look back unless you want to go that way. If at first you don't succeed, try another way. For every obstacle there is a solution.