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Browse credit cards from a variety of issuers to see if there's a better card for you.
If you already decided no apps this year, you already have the answer as to what you should do.
As far as your approval chances, do a browser search for credit pulls database and just look at the scores/profiles of those that were approved/denied for the card you're interested in and that will give you the best possible snapshot of your approval odds.
Totally agree with BBS, hold tight. With a higher score, you will get a better starting line and apr. Revisit Amex when you are near or above 700!! Good luck, whatever you decide!!