Minor grammar tip - saying "since 2 years" is a tell that you're a non-native speaker. It's a common mistake that most people will understand, but the correct phrasing is "for 2 years."
I'm sure this is a pitch you practice a lot, so I wanted to help for next time.
So what's your point exactly?
“Since” goes with a particular moment in time (rather than an amount of time) to refer to the period between that time and now, like an old restaurant saying “making pizza since 1922” or for recent events like “since yesterday.”
The other two examples work, though 'since yesterday' is still slightly forced unless its an answer to a direct question.