Hi Javier,
Could you please consider putting new questions in a new thread? The forum would not be helpful if we had only long threads with a huge mixed bag of questions in each. Thanks for considering.
The Object Manager> Tags> Rigging> Point Cache
IS the way to go. Cache the animation you have, then switch off anything that created that animation, as there is a chance that it would now double otherwise.
Inside the Point Cache, you have the option to loop.
Example:
https://www.amazon.com/clouddrive/share/e8z4MA9WP0nMfEuT8QjuqTnroEy3SSAithncJQuJm9D
https://help.maxon.net/c4d/en-us/#html/TCAGEOMCACHE.html?Highlight=point cache
(My favorite looping is typically to use the Animation System (Animation clips), but it is often more work. It depends on your needs to Art Direct your results!)
All the best