This sounds like a couple of things so we are going to need to get a little more info to figure out what direction to go. So let's start with checking for any codes.
https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing
If there are no codes then we need I assume this is an internal transmission issue but can you confirm you do not have the CVT transmission? If you do then this is a different issue.
Let's start with checking for codes and what transmission you have and we can go from there. However, I attached below how to check the fluid on a CVT if that is what you have.
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Monday, January 11th, 2021 AT 4:52 PM