Eid Mubarak to you all and May Allah grant us Al Jannah inshallah
Wa alaikum assalaam wa rahmatu Allahi wa barakuatuh.
Wa iyyaakum wa-l-muslimeen. Jazaka Allahu khairan, and may Allah accept the fast of Ramadhan and our righteous deeds.
The letter is saakinah and has tafkheem as well as and , so care has to be taken that the is pronounced from the correct articulation point and the tip of the tongue is not used, and the characteristics of the all should be given their rights, including the longest timing of a saakin letter for the characteristic of . After this the letter , needs to be pronounced carefully from the top of tip of the tongue, but special care needs to be taken that the characteristics of the letter that are not present in the letter do not carry over. So all tafkheem should be gone, since has tarqeeq, not tafkheem. Most likely this is the difficulty you are encountering, the articulation point of the is unique, and it has some strong characteristics that are especially apparent when saakinah, and afterwards the has tarqeeq and other weak characteristics.