1. "I’m sick and tired of this toxic mindset"

2. "Yeah, of course, you should focus on becoming the best version of yourself"

What are you trying to accomplish here?

Claiming that someone "should" is exactly what makes it toxic and with such a claim you are just adding to the toxicity.

Telling other people how to live their lives is simply inappropriate. By doing so, you take away the arrogance of saying that you know better about their lives.