You can always better your best. You do not 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, 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. Nothing in the world can take the place of persistence.