I honestly think you’re underselling yourself. From what you shared, your academics are strong and clearly show you can handle graduate level work. A 3.97 grad GPA plus certifications and real classroom experience already puts you in a solid position.
Four years of experience does not sound too green to me, especially if those years include leadership moments, mentoring, curriculum work, committees, or anything beyond just day to day teaching. Programs like this usually care less about raw years and more about impact and clarity of purpose.
I would not worry about not being tenured. Tenure is very state and district specific, and admissions people know that timing does not always reflect ability. I doubt that would hurt you much at all.
Your hook should probably be the combination of strong academic performance, dual certification, and a clear reason why leadership is your next step. If your essays explain what you want to improve in education and why HGSE fits that path, that matters a lot.
If I were you, I’d focus most on telling a sharp story instead of worrying about being behind. On paper, you already sound competitive