To Cancel? Or not to Cancel?

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Hey Folks I have a credit card question. I'm a newbie and I have learned soo much from this site so I thank all of you in advance for your support.

I've cleaned up my credit over the last 4 year and I'm just now getting into the middle 700s. Initially, I had one of those arm and leg, interest rate credit rebuilder Master cards, with a limit of 200 and includes a $50.00 annual fee. I've since secured a much better credit card with 20 times the amount of credit, no annual fee and a low interest rate. Was this a mistake given I am interested in buying an investment property soon? Should I cancel the credit rebuilders card I've had for 4 years? If I do, will it ruin my credit score/rating?