You may be trying something new or just starting and get a great result. Was it luck?
No, not if you had a plan and stuck to the plan. Don’t discount the work you put in prior.
Sure, you might not achieve the same result twice. This is where being able to change your method on the fly.
If you create a plan and it works then stash that good memory and build a strategy that you can replicate again and again and again over time.