WP Presenter Pro
WP Presenter Pro takes advantage of the new WordPress Editor (Gutenberg) to build slideshows. Create any amount of blocks you like within the slide block.
With this custom set of blocks, you can change the background color, font, padding, and more. You will no longer have to create slides elsewhere and then embed them on your site.
Prices for WP Presenter Pro are cheap! You can pick up a copy for $20 with a 7-day free trial.