It looks like you don't really know why you want a FF sensor...
It's hard to know what's your motivation for switching from APS-C mirrorless to DSLR FF.
In other words:
Is it because you don't like mirrorless in general?
Is it because you don't like the Fuji's ergonomics?
Is it the EVF and you would like an OVF instead?
Is it because it's an APS-C sensor? In this case, what are the shortcomings of an APS-C sensor for your style of photography? Why do you absolutely "NEED" FF?
etc.
It's hard to know what's your motivation for switching from APS-C mirrorless to DSLR FF.
In other words:
Is it because you don't like mirrorless in general?
Is it because you don't like the Fuji's ergonomics?
Is it the EVF and you would like an OVF instead?
Is it because it's an APS-C sensor? In this case, what are the shortcomings of an APS-C sensor for your style of photography? Why do you absolutely "NEED" FF?
etc.