@bomerr always plugs the quantity over quality EC idea. Do not listen! Now I know you are a CC student who did not succeed in transferring into the program you wanted, I would even more strongly tell others not to listen. Your ECs didn’t keep you out. And regarding essay topics , he has not been admitted… Do not think he has any special or even relevant info.
Regarding backup plans, it is only a walk of shame if you talked up your first choice too much and were over confident about being admitted, and if you didn’t apply to matches and safeties you are willing to attend. Most students don’t end up at their reach schools anyway.