How to improve credit rating?

I have bad credit score of 555 and 560 I was thinking of opening secured card with Citi bank the minimum deposit is $200 I thinking about applying with a deposit of $2000-$10000 will that be better than the minimum of $200? Btw I only had one credit card years ago with capital one and they closed it for failing to... show more I have bad credit score of 555 and 560 I was thinking of opening secured card with Citi bank the minimum deposit is $200 I thinking about applying with a deposit of $2000-$10000 will that be better than the minimum of $200? Btw I only had one credit card years ago with capital one and they closed it for failing to pay after I lost my job! So any advice is welcome! I make about $1500-1700 a week net as self employed and don't have anything financed what are other small purchases that I can qualified for with my credit score and improve my ratings? Besides car which I have working one and don't want waist my hard money to impress others! Thanks
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