Hey, I see that nobody replied for almost 3 weeks, so I'll give you my solution.
I use a free module (non-nulled) for WebP/Avif converting, which is "WebP Converter for Media" by "Mateusz Gbiorczyk".
I managed to convert around 500 images with this module, without buying a premium package. Really satisfying.
Unfortunately this module does not do the other things, like Compression or Lazy Load. But you can always mix a few free modules to combine this things.
Hopefully this will help you start fro somewhere, until you find a better solution.
btw. This is not a module ad, I don't have anything to do with this module, I just tested a lot of plugins and found this one to work really well for free.