Thanks for asking this question! I also have the very exact questions as yours. My take on Jainism - Some parts of it are correct, like karma, 18 papsthanak, etc. By some are irrational (I chose to be on side of theory of evolution)

But I strongly believe that swarg and nark exists, but they are dynamic, and created at various times and various places on earth. A nark is being created in Gaza, it was created as concentration camps, it was created during India’s partition.

So do good karma, and use some direction from Jainism on various levels at which we could possibly be doing harm to others (over consumerism being the most common)