DON’T (repeat do not) send promotional emails every day to every email address you’ve ever collected.
Not matter who says it’s “best practice” to send emails everyday.
That is the definition of spamming people.
Only drongos do that.
Apart from the fact it’s annoying, customers will ignore them, your open rate will go down, and your email service provider (ESP, aka Mailchimp, Klaviyo etc) will start marking you as an untrusted sender and your emails will be less likely to get to your customers inbox.
If you’re not making enough sales, address the root problem, don’t spam the good people of S’traya.