Catholics need to take action instead of being lukewarm.
There is no time for chillin.
Yes, Catholics alive at the time of V2 missed the boat.
But I wasn't one of them.
And it's too late now, humanly speaking. The Novus Ordo religion is firmly entrenched.
Remember in Lord of the Rings when that city near Gondor was conquered? However bad things were when Gondor's army withdrew, it was THAT MUCH WORSE when they tried a few days later to re-take the town from scratch.
The Orcs didn't even lose a single man. Their arrows took care of the attacking army.
That was the scene where all those horsemen race toward that city and get slaughtered by Orcish arrows before they could even reach the city. There was only one survivor (Faramir) and he was seriously wounded. It was also the part where Pippin sang, "Home is behind...the world ahead...and there are many paths to tread..." while Denethor fed his face the whole time.
However difficult the fight was back in 1969 or 1970, it would be that much more impossible today. Now they've had 4 decades to brainwash the people, solidify their gains, etc.
I'm not sure exactly what you're proposing, but depending on your actions you could be dismissed by most as an extremist or schismatic crank, and that would be the end of it.
Just go to Catholic Answers and start spouting any random truth if you don't believe me...
Humanly speaking, I don't think there is a whole lot we can do, aside from good example and prayer.
It's true we shouldn't be lukewarm, so we should learn our Faith, obey the commandments (at least avoiding Mortal sin), learn some basic Latin, learn how to serve Mass, some basic Catholic hymns -- after all, these are the things we expect the whole world to embrace, so we should at least be consistent enough to lead the way!