This may be obvious but it still bears mentioning.The only way to get good at doing anything is by doing it.
All performers must go out of their way to get as much performance experience as possible. And the key is to create your own performance opportunities.
Don't wait for them to come to you! Approach 20 different venues where you live and ask them if you can perform there.
Nursing homes. Schools. Coffee houses. Bars. Senior centers.
What's the worst thing that can happen to you? You get 20 no's. Is that really that bad?
I've found that being willing to potentially get "rejected" 20 times is one of the key traits that just about every person who has "made it" in the music business share.
If you are in need of more performance experience, I challenge you to reach out to someone about about finding a performance space today. Don't wait until tomorrow or next week. Send the email. Pick up the phone. Text someone.
No one ever acquired something like performance experience by thinking about it.