Bom dia @Rafaelhgb,
Certbot currently doesn't have any fully-supported installation method on Amazon Linux (in particular certbot-auto is not designed for use on this operating system), although I've heard that the situation has been getting better for many people. You could look at this previous thread:
There might be an Amazon-provided version of Certbot in Amazon Linux 2 or a different installation method might work.
The information that you saw about pip is not about having pip installed, but about using pip interactively to install Certbot Python packages from the PyPi repositories.
As suggested in the other thread, there are also many other Let's Encrypt clients that have fewer dependencies and so you might have more success with one of those.