I am fairly confident that alien life in some form exists somewhere in this universe. It may only be some colony of bacteria-like cells on some rock on the total opposite side of the universe that we’ll never be able to even detect let alone see with our own eyes, but I’m confident that something somewhere out there will meet some definition of life.

Moving up the scale, I get less and less confident. Simple multicellular life- still pretty likely. Complex plant/animal/fungus-like life- not very likely. Intelligent life that we can in some way make meaningful contact with- very extremely unlikely.