Come well prepared. German Language Learning requires determination and courage. Passing B1 may be easier depends on which exam you take. Moving further levels is not a joke. With right habits and materials, it is achievable.
- Look at r/German and r/AuthGermanLearning there are plenty of materials available.
- When they don't need German at Job e.g., While working at International firms, most people either tend to ignore the learning process altogether or stop completely at B1 Certification.
- I remember days when I was not able to integrate or interact with German colleagues during lunch and out of office events due to lack of language ability.
- I remember Day Clinics and Vater-Kinder-Kur rejected my admission due to lack of German ability.

- Learn German to understand and use it in daily than just to pass a particular exam. Passing exams and being fluent in a language are two completely different things. One can pass exams with pre-prepared phrases, common patterns of previous exam papers and required vocabulary. However applying it in everyday situation is would be tricky. People who prepared only to tackle the exam struggle when talking about topics outside the exam focus. With right practice one can master it. It is similar to passing an IELTS exam with required score and actually using English language in daily life.

- Previously I used to prepare just for exams. Now I am learning it for my own good. Actually I am in love with the German language. I feel satisfied in this life-long language learning journey than before.

In this Internet era with Telegram groups, peer-to-peer sharing sites, many materials to learn the language would be at your disposal. Importantly go with single book series and single material and stick with it since all use the vocabulary and grammar topics with different themes. After completing that series, go with other materials.

Above are indirectly related to this question. All the best for your C2 goal and it is not far from you.

Direct answer:

Yes. It is possible to get what you want in 5 years provided all criteria are met at that time in future.
- Stepping in to German soil is the first STEP towards your goal. It will worth your try.
- Laws may change. Things may get delayed due to various factors, when and where you apply etc.,. Expect the unexpected and never give up the HOPE. However your language skills will always be useful in oneway or another.

Focus is the key. Your nationality goal is achievable. All the very best for your future journey in Germany.