What to say when sending direct mail

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Hey Bigger Pockets family. So I'm still new to real estate investing (a little over 2 months) and I've been sending direct mail every day for the past month and still no contact. I hand write every piece of mail and send them in colored envelopes. Inside the envelope, I write a few short sentences with my name and contact info. I'm just curious to how some of you guys go about sending your direct mail and what you say to get some return calls. Much appreciated - Narek K.