I believe in Aliens, I recomended book of Marco Pizzuti Unauthorized Close Encouters,it talk about many things that have been kept hidden from us for a long time at a political level, I would recommended al the books by this author.
So here's the thing, why would they want to come here in the first place. Look at it from their point of view . There is enough nuclear arms to destroy this planet 3 times over. If you get caught you run the risk of becoming a minor god, a freak show or locked up in dome 51 never to be seen again.
We don't have any form of star drive so basically we are still in their eyes dinosaurs.
Its just to dangerous to come here, on star maps this planet has a big skull and crossbones on it and a warning not to come.
Of course every once in a while somebody gets curious, our UFO sightings, realizes its all true and gets out as fast as they can.
Our planet being stolen from underneath us by corporations keeping us glued to our phones with spouting rubbish called social media.
I rest my case.
One thing is certain: our ignorance, even at a galactic level (not universal), is total. We do not know who is or is not there. This means that we still live in a primitive world. Even technology can be primitive. Being in 2024 means nothing. We are not in 2000024. The count has just started.