As we say in the dojo 'fear is for the ill prepared'. Its one thing to write your jokes and have them in a handy notebook, it's a whole other thing to sculpt an act. And btw don't be afraid of the word 'act'. To me an act is simply an outline of your show. You hone some solid things that you know sells your character and attitude then you may always add new material or expand on the 'act' with new tags, revisited thoughts etc.
Your act is the beginning of your story, it can and should always be added to and expanded. Always grow and you will NEVER become jaded or jealous of others ahead of you and you will always find time to help those behind you.
Don't be afraid of taking a risk. Get out of your comfort zone occasionally, try new stages, find new audiences. Standup comedy is big on risks, it's built in. Often the biggest risk takers are the comics that gain the most...notoriety if nothing else.
~DISCOVER YOUR STRENGTHS.
On a personal note one of the strengths I found in myself was the ability to write pop culture jokes quickly and lots of them. I pursued it and became a pro comedy writer for national cartoonists, radio talk shows, to national talk show tv monologues.
Find out what you're good at inside your comedy circle and apply it, on stage or off... having a sense of your strengths will help you succeed. I'm living proof.
~DON'T QUIT! ~ DON'T LIE TO YOURSELF
One of the ways of success in standup or any other business is persistence. Keep at it! If you know you can grow you will grow. But make sure you ARE giving it your all.
Don't tell yourself you're working hard at it when you are not. It shows up on stage and everywhere else.
~NETWORK WITH A POSITIVE GROUP
Get with the right people that will encourage you and that you can bounce ideas around with. Writing partners always help, and these days it's a good idea to carpool to gigs!
~DON'T EVER FORGET YOU ARE A CREATOR.
Create your own! Stages, shows, writers groups, open mics, you have the power to do positive things for yourself and others...ALWAYS include others! It's just good karma. ;)