We’re still in for another 20 years of hardcore veteran Cxx programmers insisting that either the memory safety issue is overblown or just a theoretical issue if you are experienced enough/use a new enough edition of the language.
Of course if you really need that non-memory safe stuff - which all your existing code does - then you can't take advantage of it. However you can migrate your C++ to modern C++ and add those features to your code. This is probably easier than migrating to something like Rust (Rust cannot work with C++ unless you stick with the C subset from what I can tell) since you can work in small chunks at a time in at least some situations.