How can a PM crack into new domain area (say for example, AR/VR) when they work for a non-AR/VR company ?
It can be difficult to change companies AND domains in one step. I would advise you to consider the possibility that this may be a two step process, where you focus on changing one variable at a time:
Change companies while keeping domain constant.
Change domains once you are internal and you’ve built up enough credibility.
Ultimately, it is up to you what you are comfortable with. Personally, I have found gradual transitions have allowed me to achieve greater success at each stage.