Need Advice on Construction Development

So I was recently laid off. I used to work at a US based company as a Business Development Manager (night shift). I have a plan to sell of a land, and make a 5 floor building on my other land. Do I join another job? Or focus on this full time? I can earn like 1.2L per month if I join a job, but I'm afraid I'll lose a lot if I don't focus on the construction project (I'm the only responsible man handling this in my house.)

Please guide me. P.S. I live in Hyderabad.