I also used to use EWWW now I use Modern Image Formats from Automatic, this plugin is supposed to become a part of Wordpress at which point you can remove the plugin (they sure will check for the plugin once the code lives inside WP so no worries)
It creates web versions and puts them into your pages if using the WP media uploader, and you can set the quality, e.g. 80
I prepare the images in relatively big size and quality with about 1 MB (instead of the original 3-8 or so MB) in Photoshop and upload them to WP. The plugin turns it into webp while uploading.
I do not reduce image quality too much as the plugin will decrease it further anyway.
The whole image handling in WordPress is quite a task if you wanted to do every optimisation possible (AVIF & HEIC, 2x, 3x, 4x for high res, right dimension per viewport width, art direction... oh my)