Hello @Milad,
Welcome to the Wefugees community!
I hope my translation of your question is correct and you speak some English.
You can get plenty of detailed informations about return programs for prospective returnees by the German Federal Office for Migration and Refugees: ****://tinyurl.***/yd82jddr
General information about voluntary return: ****://tinyurl.***/y84ef5c5
Kind regards
Jan