Learn the Caro-Kann.
Chess opening

Personally, I would suggest learning an opening for black.
The Caro-Kann and French are also both really good openings to learn, some alternatives though include the Scandinavian, the Pirc, etc.

which one do you think is the best?
None of them is "the best". There is no such thing as "the best opening".
Your e5 is as good (or better) than anything else. There is absolutely no reason to change it, but if you want to change it, that's also okay.
Openings matter a lot less than most people think. As long as you avoid dumb memes like the Bongcloud.

should i keep on playing e5 with black against e4 or learn an opening like the french or caro kann
I play french and a carrot kann its good
should i keep on playing e5 with black against e4 or learn an opening like the french or caro kann