I’ve H1B petition approved for this year, but now mngmnt is saying no position at US location for C3B. Now shall I go for stamping or not ?

Get the stamping. It wont be like hey we have an opening go get the stamping today.

You have to get the stamping when you can and be ready anytime. Usually you will get 2 or 3 weeks lead time only when they ask you to travel

Go for stamping bro. Once you have the visa, you can explore other opportunities in the US. Don't wait for the perfect moment, just get it done. 💪