How do I hit goals through my team instead of doing it myself?

You got promoted to lead the growth team. Now you answer for numbers you can only move through other people, instead of running the experiments yourself. If you miss being hands-on in the work, that is not a lack of ambition. It is the normal ache of trading a craft you were good at for the job of leading it. The specific frustration is the distance. You used to run a test and see the result move directly from your own effort. Now the results come through a team, filtered by other people's choices and pace, and you cannot just do it yourself. That gap between responsibility and direct control is one of the most uncomfortable parts of leading, and it is real. Your job now is to build people who run great experiments, not to run them all yourself. That is its own skill, and your hands-on experience is exactly what makes you good at it, you know what a sharp test looks like. Coach that into your team, and keep one experiment of your own now and then to stay close to the work. Pick one person to level up this quarter. You can hit the number through others and still keep your own hands from going cold.