Unless this is your first ever life, one thing you know fairly reliably is that, if you do happen to live again, it will (most likely) be without the memory of this life and any other previous lives. Are your past lives bothering you or, is it this one? So, even if it's true, which honestly, I doubt, it likely won't feel like you've lived billions of years. Plus, unless there are parallel universes or whatever- you'll be someone else- surely? Different parents, likely different location, different era. That could be better or worse.
Eventually, if we haven't managed to make ourselves extinct already, the sun will explode and wipe us all out. Then, where do we go? Where were we when humans weren't on this planet? Did we inhabit dinosaurs at that point? How does all this recycling account for increases in population? Were those spirits/ souls/ consciousnesses in animals beforehand? Or, are they being created new? Or, do they come from beings from a different planet? Is that where imagination comes from? That would be kind of cool. If dragons and unicorns etc. actually exist somewhere.
I agree there are weird things about life and consciousness. I'm not a total sceptic. But still, I don't feel like many of these afterlife or multiple life theories are all that strong in terms of evidence. With the billions of lives and deaths that have played out on this earth, you would have thought something more definitive would be obvious by now.