Seeking Peace and Strength on a Difficult Path

Assalamu alaikum. For fifteen years now, life has been a heavy test, a cycle of hardship that began with the passing of my beloved father. My mother has struggled with her emotional health ever since; every year she faces a difficult period where she is not herself, becoming anxious, dependent, and unwell in spirit even when her body is healthy. Carrying this burden since childhood has left my heart and mind utterly exhausted. Our family has endured some truly dark times, and much of our pain, sadly, stems from the actions of my mother's own sister. I do not wish to speak ill, but her behavior has caused deep wounds, driven a wedge between us and our relatives, and she continues to bring trouble into our lives while maintaining a pious appearance. We are largely alone-no strong community around us, no elders to turn to for guidance, and most family ties have been severed. I finished my studies a year ago, but I feel withdrawn, empty, and completely drained. I strive to maintain my prayers, recite Qur'an, seek forgiveness through Istighfar, and practice sabr, but some days the weight of it all is just too much. There are moments when I miss my father so intensely, feeling that we have no one left to shield or support us. The most painful part is witnessing how some people cause harm to others without any fear of Allah. How can they rest easy after inflicting such hurt? I truly cannot comprehend it. I am not sharing this for pity. I am simply weary, feeling hopeless and overwhelmed. If any of my brothers or sisters in faith have faced similar trials, how did you find a way forward? Were there specific du'as, verses from the Qur'an, or words of advice that brought you real comfort and strength during your own difficult years? How can I make this situation better?