Welcome to the Wefugees Community and thank you for reaching out to us again.
Unfortunately, I am not aware of any realistic option to apply for family reunification with adult (healthy) brothers. Maybe a studying (according to section 16b of the German Residence Act) or apprenticeship residence permit (section 16a) could be an option for you?
A similar situation was discussed here - maybe you can check this answer as well.
Dear @mbeon-christine and @mbeon-Rukundo: Would you agree with my thoughts or perhaps want to add some information?
@questzone: Please don't hesitate to get back to us with any further questions!
All the best,