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What is the ultimate goal for a Buddhist?

welcome

here, it easy to simply quote the scriptures:

So then, monks, the holy life is led not for gain, honour & fame, not for the endowment of virtues, not for the endowment of concentration, not for the endowment of knowledges and vision. Bhikkhus, it is for the unshakeable release (freedom) of mind that is the essence and end (fulfilment) of the holy life.

The Major Discourse on Heartwood This is the path of practice leading to the cessation of suffering: This is what I have taught. And why have I taught these things? Because they are connected with the goal, relate to the rudiments of the holy life and lead to disenchantment, to dispassion, to cessation, to calm, to direct knowledge, to self-awakening, to Nirvana (peace). This is why I have taught them.

Simsapa Sutta: The Simsapa Leaves