Trending @Infosys; How to get early release

I have an offer but I didn’t resigned yet it’s been now month ago I got this but now I changed my mind and I want to switch now to meet the joining date I also asked next company to change the joining date but they are still discussing and it’s getting delay in putting the paper Now I am not sure how can I able to get this worked Joining date proposed 1may and I have 90 days of notice

Any thoughts on this much appreciated.