pulling equity from home to finance cash deals

[Dok Kim]

hello, first post, thanks for any help.

My home is worth 1.25M, loan is only 350k, tried to get heloc, but bank will only give 200k because of my income. 

So I have about 900k in equity, was hoping to get a heloc for 500-600k to buy properties at auction.  What other options do I have to pull the equity from my home to get a larger amount?

I have owned 1 investment property which I rented for 2 years, and sold for 225k gross profit. Current home I bought from bank as foreclosure, was a house being constructed when builder went bankrupt, I bought and finished it.  This home is up 500k from what I have into it. 

So this is how I have so much equity in this house but need a way to pull the equity out.