Consultation for construction and real estate experts

I have a consultation and the consultant is trustworthy I ask that you guide me with honesty and integrity I own a land in Mecca, 600 square meters Residential worth 500 thousand with electronic deed I want to build on it for residence, I want to live there But my financial ability does not allow What is the way.. Should I divide it into two plots 300 / 300 m Sell one and build two floors on the other Is there a bank that would build it for me, make four apartments, and take installments for two apartments Anyone who can help me How can I build it and live in it