Nothing is in Cancer or Libra except them ruling the 1st and 5th house respectively. In my OP I was meaning the Grand Cardinal Cross that's occurring this April in general, and how that general Grand Cross would affect me since I have Aries and Capricorn heavily in my chart. I don't have any planets in Cancer or Libra though but I didn't know you had to have those as well to be affected.
Thanks for the explanation. Yes there is a claimed Grand Cross involving Mars (Libra) Jupiter (Cancer) Uranus (Aries) and Pluto (Capricorn). They all reach the same degree of their respective sign (13 degrees) but they never reach the same minute, at the same time. In reality the four squares do not perfect simultaneously. They are spread over about four days. That's one of the problems of using aspect patterns, they rarely perfect at the same time, Many modern Astrologers would argue that perfection is not important, it's the lines on the chart that matters or at least very close proximity.
Whether or not simultaneous perfection matters, the planetary transits to natal planets may well perfect you may experience or have experienced several transits to your natal planets in Aries and Capricorn by Conjunction, square or opposition. I can't tell you when without your chart to hand but I can tell you that they will not occur at the same time and indeed they may well be spread out over several months or longer. So if all the transits work, and they don't always, you may be in for an interesting time (or already in the middle of it).
Given that you've got several planets in cardinal signs, I'd look at how they are affected and when, and the houses involved. You will probably have your work cut out looking at those without worrying about the 'Grand Cross'