Any mistakes?

It's meaningless waffle, I'm afraid.

For me, the term "self-efficacy" stands out in this sentence rather like the proverbial sore thumb. I had to look it up; as far as I can gather, it means something like "self-belief" (https://en.wikipedia.org/wiki/Self-efficacy). Perhaps "self-belief" would be a better choice ...

just focus on the vision/purpose of my life, then my self-belief plays a big role andd everything falls into place.

"I just focus on the vision/purpose of my life, then my self-belief plays a big role andd everything falls into place."
Is it fine now?

Shelby Killuminati"I just focus on the vision/purpose of my life, then my self-belief plays a big role andd everything falls into place."Is it fine now?

I think it's tolerable. For me, "then my self-belief plays a big role" does not fit perfectly. I think the reason may be that "plays a big role" sounds long-term, whereas "then ... falls into place" sounds sho

Shelby Killuminati"I just focus on the vision/purpose of my life, then my self-belief plays a big role andd everything falls into place."Is it fine now?

It still has that strange taste even though you used " belief" in the sentence as suggested. Logically, this passage makes people ponder with questions. Does the focusing in your life makes everything f

Actually I am answering to this question "What do you do to balance between the two(gaming and working/studying), and how much time would you say you spend on gaming compared to working/studying.
So I think my answer is fine in this context.

Or is it not?

Shelby Killuminatigaming

That word means gambling or playing video games.
Do you perhaps mean "leisure" instead?

Video games and leisure yes