Hi!
Your team thread has been locked already. Generally we don't delete threads unless absolutely necessary- in your case, simply having it locked will do.
Regarding the thread you submitted: if you submit a thread and it doesn't meet requirements, it will be deleted/disapproved. Your thread was deleted due to an insufficient/lacking introduction, which I take it is amongst the things you wanted to add? :) Just make sure you meet the necessary requirements for a thread before hitting "submit", and it'll be approved.
So what you do now is, resubmit the thread with the bits you want to add, added. If you need the thread content you should've kept a copy of it for yourself just in case! I can forward it to you in a PM as soon as I can. ;)