Can someone help me fix this sentence?

This sleep was my first time that I ever had a long, good nap of October month.

I'm not sure what you're trying to say.

This was the first good nap I've had in October.

I mean that "these two days were my first good nap that I have had in October." Is it right?

A nap isn't the right word here. It means a short sleep -- usually two hour or less.

Certainly! I'd be happy to help you fix that sentence. To clarify, are you looking to correct the grammar, rephrase it for clarity, or make any other specific changes? Please let me know so I can assist you better.