Your voice cracking at open mic is still braver than the perfect singing you do in the shower for nobody.
CREATIVITY
CREATIVITY
A flawless performance for nobody costs nothing and proves nothing. The cracked note in front of a room is worth more because it happened where it could go wrong, and doing it badly in public is the only route to doing it well in public. The shower is a rehearsal space, not a test.
Take one thing you only do privately and do it in front of people this month. Let it be worse than your private version, because it will be. That is the price of the skill you are actually after.
What do you only perform where nobody can hear?
Free, with nothing to buy inside it.