C++ has more features than Rust but you can limit yourself pretty severely and use "simple" features to get far more safety and convenience than C without having to wrap your mind around Rust.
True for your new project from scratch when you already sucked up C++ such that you know what&when.
But at this point you know C++ pretty well (including all what you don't want to use, take a look at the CPP Core Guidelines), and using Rust is almost trivial, since Rust doesn't really introduce anything really new you wouldn't be already familiar with.