I have known the Drake equation since the first Cosmos series, back in the 70s.
I just know that (going by our only example...us) it takes a VERY long time, and, a VERY special set of circumstances, available elements and locations for life to be possible, not even talking about making to an advanced civilization capable of building a telescope, not to mention spacecraft.
All in all, I think the number of civilizations in any particular part of the universe isn’t going to be much higher than 1, with all the special factors needed.
Then you have to deal with the distance problem. Getting around the speed of light may be impossible. Generation Ships might get around it, but, that’s if we are lucky.
Its fun to speculate about such things, but, reality is a harsh mistress.
You are assuming the speed of light is a limit.
The math proves that FTL is not possible but shrinking the space between objects is.
Plus, have you ever listened to Bob Lazar talk about that space ships he worked on at Area 51? I’ve listened to him talk since he went public- he has never been inconsistent, his physics knowledge is correct, and I believe him. in fact, the way he describes it is the way you would have to get around the FTL limit.
We’ve recently deteced gravity waves, and so the math is correct. Which means space can be compacted. Gravity is so weak compared to every force that if you are able to amplify it then you can bring Mars a footstep away.
There are some good videos (before Photoshop) that show alien spacecraft making 90 degree turns. That would require gravity propulsion.