Should i use share or Mix of debt and equity to finance my project

I have WACC for current and Proposed calculated and if I want to calculate weather finance my project with All shares issue or use combination of Debt , Preferred shares and share.

I have 2 billion project and proposed market share rate is $23… My existing common shares worth 1 bill and current market price of the share is $20.

Am I better off using shares to finance the project or mid of debts and equity

I am confuse and not sure what to do , my WACC for current is 5.00% and proposed Wacc is 6%

Thank you in Advance