A list of "pantheons" that are fully open (that I'm aware of):
(I might miss a few more)
Fully open means that you can right away start worshipping the divinities of your choosing without any connections to ethnicity, race, skin colour and etc.
You don't have to be "called/reach out" by a deity from these paths to start worshipping them.
All you need to have is – being respectful, having patience, being aware of and learning about the traditions/practices in these paths and love the Gods!
Obviously a path/religion being open doesn't mean you can just barge right into it being all disrespectful of and disregarding the customs of these religions and cultures that are from. (Which is pretty a obvious fact, but it's better to mention it.)
Here are subreddits where you can go learn and ask more questions about the religions I have listed:
I guess a short and (very simple) post, but still. I wish y'all all the best and let the Gods guide you.
PS. In general the rule (or I guess, a pattern) of a "pantheon" being open, roughly speaking is – if a certain path has no surviving continuity to the modern times, which the ones listed don't have, (and if someone tries to convince you otherwise, you can know that they're full of shit). Worth also noting that, if you see someone talking about the necessity of being connected by "blood and soil" while talking about the paths I mentioned above, you found a nazi/"folkist", and better stay far away from them.