When the verb is a form of "to be," "still" should appear immediately after it. From the Cambridge Dictionary: We usually put still in the normal mid position for adverbs (between the subject and the main verb, or after the modal verb or first auxiliary verb, or after be as a main verb). "To be" is the main verb in this sentence. Link: https://dictionary.cambridge.org/grammar/british-grammar/adverbs-of-time-and-frequency/still. In the future, perhaps other options will be considered.