Reducing the notice period upon resignation to take another offer

Hi Sir!

Good day!

I have resigned from my company and they served 30 days' notice as per the contract.

Now, I have an offer from a new company but it's urgent, I requested them to reduce my notice to 20 days and will pay for the 10 days left. But they declined.

What actions should I take to grant my request? I haven't used my annual leave and I'm running 11 months.