Language statistics on the latest div3 A problem show that around 85% of people are using C/C++ here.

This is INSANITY! You do not need C/C++.

Statistically speaking you will never reach div1 where using a really really fast language can make an edge. Statistically you can (by definition of elo) NEVER have the problem of language choice here.

Have you not noticed that all editorial solutions in your division are in the slowest language (python3): https://codeforces.net/blog/entry/120165

What is worse, using python3 in div2 and div3 gives you an advantage, because it is a simpler language, and code is shorter to type and easier to understand.

Look at this list of language popularity and think about it.

And if you must have a fast language using Golang or Java is both easier and more job profitable than C++.

Disclaimer: This ofc does not apply for people working/seeking a job in industries that require C++. And ofc this does not apply to you specifically, because we all know you are the future legendary grandmaster.