If you wait until x, you can’t do y.
Of if you only had x, then you can do y.
Don’t make excuses for not doing what you want to do. Do it.
The associated post is here. Go read it. Well, read it first. Then watch the video.
Somewhat related, not starting/buying/doing/going until a perfect th’need is available. There’s probably a Fallacy name for that.
It probably falls quite squarely within the Toolbox Fallacy.
In the end, if you make excuses to not do x until a better y is available, then you will always be waiting.