Well, not yet for me.
Tried doing cold emails for a B2B cybersecurity biz, and also for a B2B web development business.
We'd scrounge up some emails, load them to an email bulk-sending platform and send them out...some unsubscribed, some reported us for spam, some stayed. Depending on your service and the strength of your sales writing, you could be sending out at least 20 - 50 emails per week/month before anyone really writes back or calls for a sale.
Right. That's what I was nudging you towards.
It will work because no one will refuse an offer that grows their business, only question is...will your system work? Have you ever spent more than $500 to generate leads for yourself? The nature of the business also typically needs 2 or more people, or you'll burn yourself out fast. Anyway, best wishes and good luck.