It would be a fast host (and client) for more heavily modded Minecraft.
You could self-host an LLM, but unfortunately 18GB total system RAM (so less than 14GB usable by the GPU?) is pretty skinny.
You can do some stuff to an iPhone with one. Like sideloading, I think?
Some mod packs are just unstable.
Could be a specific area/item crashing it, and TBH all modded servers need regular maintenance like mob culling and regular server restarts. But it could also be a problem with your host, yeah, and the M3 Pro is going to be way faster than any CPU your host has. Plenty of RAM too.
I’d recommend running it with GraalVM EE as your JVM.
I tend to gravitate towards Enigmatica and ATM myself (as their devs/dev process is pretty good), but not sure about Ozone or skyblock mod packs.