Whn a slave make dua to Allah swt and he still not accept what he asked for. Then the proper adab with him to Allah is, he shouldn’t give up on rahmat of Allah swt.
Ibn Athaillah in his kitab, Hikam, stated that, whoever Allah swt give taufik in his tongue to enable him to ask from Allah, to pray out to Allah swt, then it is a sign that Allah swt wanted to accept makbul his duaa.
The types of ‘pengabulan’/dua acceptance are sometimes in cash, or it will takes some times to makbul(10,20years later etc),or maybe Allah will give it to their children instead, or their grandchildren etc, but it will be accepted no matter what.
Or else Allah swt will replace it with something else because the thing that we asked for is actually can give us musibah. This happens alot to mukmin, they asked for something but Allah swt didnt makbul it to save them from musibah.
Allah swt will not leave any of our dua without accepting it. And also, Allah swt saves the dua till the day of resurrection.
On that day, we will see the rewards for every dua, its so big, and we will feel that we hope our dua will not be accepted in this dunya and so that we can gain the rewards on the last day because the reward will be everlasting. Compare to everything falak that we get in this dunya that will be broken, destroy and die.
-ustaz iqbal zain al jauhari.