Contrary to the fear of over-sending, emailing at least five times per month improves deliverability. Email providers view consistent recipient engagement (opens, clicks) as a sign of a credible sender, leading to better inbox placement and significantly higher open rates.
Don't fear unsubscribes after trying a new tactic like an emoji. A high unsubscribe rate often means your email finally stood out to a long-disengaged segment. This prompted them to take action and clean themselves from your list, which is a positive outcome for list health.
Obsessing over a single "best day and time" is a flawed strategy. Different subsets of your audience are active at various times, including nights and weekends. Sending emails at varied, unconventional times ensures you reach these distinct segments rather than repeatedly hitting the same group.