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 addon plugin for <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" title="Order reminder email for customer, Staff and admin" width="750" height="422" src="https://www.youtube.com/embed/nkVBYRXFStk?start=2&feature=oembed" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></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 and a reminder email on 25th April 2020 2:30 PM
Sending of the email are handled by the WordPress Cron, so there can be a delay in sending of email if your website does not have any visitor on that time so we recommend setting up a system Cron job in your hosting, so Cron can be run even when you don’t have any traffic on the site
<ul>
<li>You can set how much time before a regarding should be send</li>
<li>subject of the email send</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 before 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 Woocommerce

plugin to remind your customer of upcoming delivery or pickup

This is an add on plugin for order delivery date and time plugin, it allows you to send a reminder email to your customer regarding upcoming delivery  …

PJW Blogminder vs Delivery pickup reminder email Woocommerce