if you app for 2 new cards and you only have that one loan, your AAoA is going to take a big hit and become 4.6yrs. so you might as well app a 3rd card right now, puts you at 3.5yrs. that way it can age with the rest and 3 cards gives the most benefit to your score. your score has been stuck but now it will be able to grow.
be careful about which 3 cards that you want to get, chase would probably not let you add 3 cards at once for example. also it's better if you don't pull the same report more than twice in a 6mo timeframe.
