--snip--
I have 0.00043722 this much btc in my btc wallet left over from it. I guess this is not accepted as a guarantee.
--snip--
Well, that's simply not how collateral works. Collateral is meant to cover the complete loan + intrest in case you default.
You cannot get a 0.52
BTC loan with a 0.00044
BTC collateral.