Capitalism is still pretty stable, a lot of are mentally ill (otherwise I can’t explain why someone like Trump is so popular).
Then you need to read theory, this is an ableist and immaterial answer. Fascism is an attempt to set the clock back, so to speak, and takes the form of an alliance between the bourgeoisie and petite bourgeoisie along xenophobic and nationalist lines. It is a reactionary response to Capitalism’s decay.
I mean I agree with your points (which are undermined by mine), yet that doesn’t mean that capitalism is falling apart - and that means IMO that a major part of the people agree (and especially those with power, be it financial/political or military), that the system is is inherently flawed, and needs to be changed. But exactly that is something I’m not seeing anytime soon.
If you understand that the rate of profit trends towards zero, why would you think Capitalism is stable?