Changing Client after H1B Picked in Lottery (Advanced Degree)

Hello all,

My H1 B got picked this year in Lottery (Advanced Degree -EVC format) and i got the receipt number as well. I know that i will be getting an RFE for client letter and employer employee relationship.

But my client is not ready to extend my contract because of budget issue. I have an other opportunity in hand ready (EVC format).

If I change my client now, Is it possible to amend the LCA and send new client details?

What all other options i got ?

Thanks in advance