Is it dangerous to live in Germany if you know too much and are a witness of highly criminal processes by the authorities and the judiciary V?

Yes and without a doubt.

Who will finally stop this avalanche of arbitrary actions, and where is the rule of law?

Where are your fundamental rights as a citizen and your right to physical integrity?

You expose the criminal actions and misdeeds of those accused from the authorities, some at the highest levels. That makes you a target. As the years go by, you will continue to experience harassment, intimidation, coercion, discrimination, and much more.

Those involved also try to somehow keep you out of circulation with their shameful, arbitrary and highly criminal actions.

Every time something new is thought up and will be used against you. 

Because you have become an unpleasant opponent for those accused  and you have law, order and the truth on your side. To this end, some kind of nonsense and is invented and used against you every time. You, as a citizen, are literally exposed to arbitrary action.

Behind these despicable actions is largely a group of criminals and neo-fascists from East Germany, Former GDR (the root of all evil), under the guise of the "state."

Are there any monitoring personnel or supervisory authorities there? None so far.

Further concrete examples:

Privately and at home, you as a citizen and those around you have virtually no peace anymore.

Now you are de facto being harassed, followed, and outright bullied and much more, both at and during your work.

1. On October 30th, 2023, in your absence, a policewoman (Police station 21) from Mörkenstraße 30, 22767 Hamburg, who seemingly has nothing else to do but track down, denounce, and humiliate citizens, appears in your colleague's office.

The nice lady is asked by her colleague what she wants.

The policewoman replies:

She has to bring you "mail," "that's why she came".

Without giving her name or any further information, she disappeared as quickly as she had arrived.

It should be noted that these same people are torpedoing every day in your private life with their "mails". 
Yes, we're talking about Germany, and such scenes are taking place in Germany.

To be continued.