I feel you are not ready for sa currently.
Your forum presence is lacking, You rarely provide feedback within applications.
At times you can be unstable, You also have a tendency to hold grudges against some staff members for decent amounts of time. As a lead team you are supposed to support the staff team and helping this if needed.
I am not sure about other lead team members but I have rarely been contacted by you about any important matter. I feel you need to improve on your communication with the current lead team.
I also feel you dont show much leadership skills currently.
If you work on the things i have listed i am sure you might be a good Lead team member.
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