:salam2:
from my experience it depents on oneself wether the dua is accepted or not. for example was the dua rightly receited, with praising Allah first than by saying Bismillah... direction to qibla... etc and then how is your manner when praying towards Allah... do you trust HIM cuz you love HIM and feel confident of HIM or do you trust HIM cuz you have to trust HIM cuz you don´t have another opportunity than praying to HIM.... this is like I have to undergo an opperation and I live in a small village and there is only one doctor and only he can operate me... I don´t trust him since I don´t know him and I also don´t have a special relationship to him but bec there is no other alternative I have to trust him... this is exactly like some ppl are with Allah Subanallahu Teala...
this hadith qutsi I read here on tti matches well with the topic:
"I am as My servant thinks I am. I am with him when he makes mention of Me. If he makes mention of Me to himself, I make mention of him to Myself; and if he makes mention of Me in an assembly, I make mention of him in an assemble better than it. And if he draws near to Me an arm's length, I draw near to him a fathom's length. And if he comes to Me walking, I go to him at runnig"
In Surah Al fatiha we pray every day: " YOU alone we whorship and YOU alone we ask for help."