Cold mail open rate

Why my open mails rate is not so good? I'm selling subscriptions for stores and getting always 10-30% open rate, 7-10% click rate and in general I made only 1 conversion. I'm sending mails to stores from yellow pages & instagram stores profiles. How to improve? (I can send you also email templates I've used)

Author: invalid@example.com (smithalice950)

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