Really need some clarity with Notice period.

I am a Data scientist with 2 years of experience. Recently I resigned from my position. For a new job, based on the fact that I can buy out my notice period based on HR policy.

The offer that I have wants 60days notice period and are okay to wait till 75 days. But my notice period is 90 days and my current manager isn't willing to reduce it even by a single day.

That's just toxic. But it is what it is. Any suggestions on what to do. The offer that I have is a really good offer which I don't want to miss out.

Any constructive suggestions or way outs will be appreciated. Thanks