Rust

I think if Rust people want C and C++ devs to switch over, there needs to be a lot more documentation that's easy to follow on how exactly to do that. For example with Swift there's an amazing tutorial called Swift for C++ Practitioners that step-by-step goes over all the equivalent functionality and how to translate existing concepts over from one language to the other. I think Swift at least has the edge there with familiarity because the syntax physically looks closer to C-like languages, so when that's not the case, even more hand-holding is going to be necessary IMO.