Who do you think Messi's biggest opponent is after Cristiano Ronaldo?

I think Messi's biggest opponent now is himself!

Fans and the media always like to find some potential opponents for Messi, except for talking too much. Messi, 32, is now the biggest opponent. How to protect your body from injury, how to keep your physical strength more reasonable, and how to rely on your own consciousness and skills to exist on the court for a longer time when you are getting older and the speed advantage is becoming less and less obvious. This is what Messi needs to consider now and in the next few years.