Well, I'll believe that when someone develops an alternate truth-based microprocessor, or sends an alternate truth-based spacecraft to take pictures of Neptune, or an alternate truth-based lack of dying from cardiac failure, or says incomprehensible complex stuff that I don't understand but transmits the same complexity from New York City, U.S.A., to Perth, Australia so that someone there says the same novel incomprehensible thing within a couple of seconds but without using telephones and all the rest of the technological stuff we've developed using our understanding of reality.

That is, if your perspective is incompatible with realism, you'd better be able to document it extensively, or I will not be impressed, nor should anyone else.

We do have alternate perspectives on reality, and sometimes we like to try to elevate perspective to reality and then get angry that others' perspectives don't align. But we have all the conceptual tools needed to deal with this in the ideas of subjectivity and intersubjectivity.