As others have said you might want to keep it open until at least after the six months mark. After that, you can try for a higher caliber Cap 1 card. And maybe, just maybe, Cap 1 will be back to combining accounts. If so, you can combine the starter card into the new card and close the starter card. Your new card will include the older card's limit. That, of course, is dependent upon whether Cap 1 will start combining accounts again.