回複：NIW DIYer needs help! ! Experts please come in.

You need bring every significant thing you have done to USCIS. You need to talk not only your present work, but most of your past work.

Your former boss' letter in needed, but not so important as independent letters. All reference letters can talk about everything you have done.

Since you have decided to file by yourself, why not take the advantage of "free evaluation" provided by almost every immigration lawyer. They may tell you where you are standing and the strenghth of your case.