Sure, if you discount the fact that other people exist, are conscious, have their own experiences of the same world and also experience joy, sadness, love, and suffering.
To assert that your perspective is the only thing that matters is to assert that nobody else matters.
its a matter of perspective. if everyone is one, no one indeed matters, nor exists. This is not discounting anyone nor any fact. what does not exist cannot be discounted.
To assert that your perspective is the only thing that matters is to assert that nobody else matters.