I don't feel like we've really tried hard enough at teaching them the traditional way to say that we need to "uplift" them through some kind of technology. It's still possible that we could turn whole species into people just by refining our techniques for teaching them language.
Yeah, no. Humans have the in-built ability to learn "language" in an abstract sense. Other animals - they just don't. We don't have to do anything special for humans to learn languages. Humans even without formal teaching will learn all sorts of connections about the world around them in ways other animals just clearly don't.
Other animals, even the smartest ones hit a bottleneck with learning even simple languages, and they fail at teaching this to their own kin. For it to be viable, a chimp would need to learn language and also impart that language onto it's young. No amount of magical-thinking teaching techniques is going to make this happen, chimps just cannot comprehend it. If you teach a chimp 100 signs in sign language but it fails to comprehend how it could show signs to other chimps, then you're at a dead-end with trying to educate chimps: there's no synergy there, you're just painstakingly teaching each chimp what each sign correlates to through rote learning. They don't get the snowball-effect where learning earlier signs opens up a huge world of combining signs and abstraction to learn future stuff much more easily. Chimps can do a
couple of combining-symbols things, but they're more like diminishing returns than opening up a vista on how to use grammar to construct more interesting things. Human language manipulation definitely seems like an evolved capacity that is in fact specifically evolved in humans, so there's no reason to expect that animals have that capacity.
If they had the capacity, they'd already be using abstract languages
long before we got to them.
The only really viable thing we could get without uplifting is some sort of technological communicator that can decode/encode dolphin speech and we can perhaps talk to dolphins in their own language.