So, you should worship only God, arid be among the grateful.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (nay, but allah must thou serve) you must believe in allah's divine oneness, (and be among the thankful) for what allah has bestowed upon you of prophethood, scripture and islam!
Jalāl al-Dīn al-Maḥallī
تفسير : rather, worship god, alone, and be among the thankful, of his bestowal of graces on you.