[greybeard]

One of the major barriers to non-duality is the assumption that there is a this causing a that.
It is my understanding that the way the Creator set it up it is on going evolution/creation and self regulating.
There are consequences for every action but the action does not cause a specific reaction.
For example the marigold seed has the potential to develop in to a flower.
It needs the environment of water earth sunlight to develop its full potential but the environment while necessary does not cause it to blossom into a full flower.

Service to "others" will not cause them to give service to you but may help to set up an environment for their spiritual growth. their spiritual growth is also your spiritual growth and so on.

Chris
Namaste