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As far as I know, will you probably still qualify for the "privileged" Niederlassungserlaubnis (permanent settlement permit) according to §28 Abs. 2 S. 1 AufenthG due to your marriage with a German citizen. If you want to check the requirements for the regular permanent settlement permit according to §9 AufenthG, please have a look here. However, as your marriage lasted for more than 3 years, you will always still have the option to apply for an extension of your limited residence permit according to §28 Abs. 3 in connection to §31 Abs. 1 Nr.1 AufenthG.
I hope this helps and please feel free to get back to us with any further questions!
All the best,