my website is under maintenance due to theme update and re-platforming. currently, i receive a lot of traffic. i want to put subscription box on my maintenance page so that users can subscribe to the website back in work notification. I will send newsletters to visitors once my website is live so that i don't loose my customers.
Try Meetanshi's Magento 2 Maintenance Page to show user friendly notice when the website is in maintenance mode.
Rather than just showing a notice, you can display social media buttons, countdown timer to show when the website will be working and live and also, the newsletter subscription box so that the users can subscribe to notifications.