Notice period negotiation

I wish you success in your career whomever is reading this,

I have recently got an opportunity in another company with a 140 percentage hike, but the have given a joining letter of 15 th July, Hr of future company said that they can wait till 30th July and no more

Tcs last working day is 8th Aug. I am asking them to make it 30th July but they said , no no no you have serve notice period of 90 days

I don't want to miss the golden opportunity.

Genuine suggestion will be very helpful In my career anyone who is hr at manager level or who went through this please help me with this.