Let go of comparing.
Let go of competing.
Let go of judgments.
Let go of regrets.
Let go of worrying.
Let go of blame.
Let go of guilt.
Let go of fear.
Have a proper belly laugh at least once a day (esp. if it's about your inability to let go of any or all of the above).

Sometimes what you're most afraid of doing is the very thing that will set you free.

I think part of the reason why we hold on to something tight is because we fear something so great won't happen twice.