(1) You are unlikely to achieve good results with a one-size-fits-all cover (proposal) letter. Each letter should be tailored to each individual client. (Just sayin'.)
(2) There are already plenty of forum threads on this subject. Read these. Ask questions after you have read through already-available information and hints.
(3) Write your own letters. Do not rely on others to do your work for you. (Just in case that is what you were hoping to do. Rely on someone else's example as your own template, that is.)
(4) I just looked at your profile. I cannot suggest strongly enough that you remove the breezy, cheerful guarantee of infinite ("unlimited") revisions to your work. Read through this forum to see why I would suggest you do that. Just... so... unwise...
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