Peter Westwood

This plugin allows your users to configure a reminder to be sent to them if they haven’t posted in the last n days.
You configure the reminder on your Profile page (or the profile of another user if you have than capability)
It is in the Personal Options section and called Blogminder Threshold

PJW Blogminder

This plugin allows your users to configure a reminder to be sent to them if they haven't posted in the last n days.

PI Web Solution

This is an add-on plugin for the <a href="https://wordpress.org/plugins/pi-woocommerce-order-date-time-and-type/" rel="ugc">order delivery date and time plugin</a>. It automatically sends a reminder email to your customer regarding upcoming delivery or pickup for their order. You can configure in the plugin how much time before a reminder email should be sent.
<iframe loading="lazy" class="youtube-player" width="750" height="422" src="https://www.youtube.com/embed/nkVBYRXFStk?version=3&rel=1&showsearch=0&showinfo=1&iv_load_policy=1&fs=1&hl=en-US&autohide=2&start=2&wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe>
E.g.: If the user places a pickup order for 25th April 2020, 3:00 PM 
and you have set the reminder time to be 30 min, 
then the customer will receive a reminder email on 25th April 2020, 2:30 PM.
Sending of the emails is handled by the WordPress Cron, so there can be a delay in sending emails if your website does not have any visitors at that time. We recommend setting up a system Cron job in your hosting, so Cron can run even when you don’t have any traffic on the site.
<ul>
<li>You can set how much time before a reminder should be sent</li>
<li>Subject of the email sent</li>
<li>Email header text</li>
<li>Email message part</li>
<li>Send reminder email to the admin and staff so they can prepare the order ahead of time</li>
<li>Set a different trigger time for the admin reminder email (pro)</li>
<li>Set different subject/header/message for the admin email (pro)</li>
</ul>

Delivery pickup reminder email for Woocommerce

plugin to remind your customer of upcoming delivery or pickup

This is an add-on plugin for the order delivery date and time plugin. It allows you to send a reminder email to your customer regarding upcoming deliv …

PJW Blogminder vs Delivery pickup reminder email for Woocommerce