السلام عليكم ورحمة الله وبركاته أحسن الله إليكم I give you glad tidings on my hadith journey. I want to aim for Bukhari at one point, but now umdah and then bulugh al maram. I memorise easily , Alhamdulillah. But, I still suffer from sins, and sometimes the motivation goes down. What should I do ?

This is the story of everyone. Everybody sins, everybody. Sometimes they're very strong and active in memorization, and at other times they're not. Keep going, keep going, don't stop. Barakallahu fik. Never stop, no matter what happens. Never ever stop, or you will never accomplish what you set out on. This is a general rule in life: you have to be patient and persevere, and spend years upon something until you reach the goals, bi-idhnillahi tabaraka wa ta'ala.