Maybe sit down and write your core values as well as your perspective on the world, and then ask yourself "what can help me support these beliefs?" Do some research. Don't be afraid to look at "strange" religions. As an example, before I aligned myself with Satanism, I thought it was "strange" anyone would believe in Satan. After reading about it when I started doubting myself, I became happy that they share my core values. And then I decided I must have been born a Satanist, and I believe in Satan being not a god but a metaphor for the ideal human. Because you have tried other beliefs, prehaps consider what you like and what feels "wrong" to you. Religion is diverse and the only wrong is that which harms you against your will. It takes some time to settle into the path. I would recommend you research one or more of the following since you are atheist: general witchcraft (not Wicca, although you can pull from Wiccan sources), Hindu philosophy, LaVeyan or atheistic Satanism (which is mainly a philosophy), atheistic Paganism, and/or Luciferianism. These are not religions that intend to harm the curious, and you will find conflicting sources as well as mainly Christian propaganda telling you they are "evil", but the truth is that religion is indeed made to find who we are and share ourselves with like-minded individuals. Perhaps in the beginning you will feel unsure and may even need to hide your practice(s) from others until you can and do feel comfortable around them, but this is natural and when you can, practice the tenets and philosophy of a path you choose. And remember it's always okay to think outside the box.