Welcome back to the Wefugees Community and thank you for reaching out to us again.
We discussed the requirements for receiving a permanent residence permit (Niederlassungserlaubnis) as spouse of a German citizen a couple of times on this platform. Please see, for instance, this thread for more information.
Regarding the naturalization of German's spouses the ministry of interior (BMI) writes:
Section 9 of the Nationality Act
Spouses or registered same-sex partners of German citizens are eligible for naturalization after three years of legal residence in Germany. They must have been married or in a registered partnership for at least two years at the time of application. The general requirements for naturalization also apply.
For more information, please contact the naturalization authority responsible for your place of residence.
What are the (general) requirements for becoming a naturalized German citizen?
Section 10, para. 1 of the Nationality Act
To be eligible for naturalization, a person has to have lived legally in Germany for at least eight years and possess the appropriate residence permit. Foreigners who have successfully completed an integration course are eligible for naturalization after seven years. Persons wishing to become naturalized citizens must also declare their allegiance to our constitution and have a sufficient command of the German language. Knowledge of German is an essential prerequisite for integration into our society. Candidates for naturalization must be familar with the legal system, society and living conditions in the Federal Republic of Germany (naturalization test) an be able to support themselves without recourse to social assistance, unless this is due to circumstances beyond their control; nor can they have committed any serious criminal offences. In addition, they must give up their previous citizenship. In certain cases or for certain groups of persons, however, multiple nationality may be considered.
Special rules apply to persons with special status (displaced foreigners and stateless persons), making it easier for them to become naturalized citizens.
Your local naturalization authority will be able to tell you whether you are eligible for naturalization and how to apply.
I hope this helps and please don't hesitate to get back to us with any further questions.
All the best,