It is a rhetorical question that shows the speaker's exasperation.
Explanation:
In the poem, Walking Alone by Lawrence Raab, we read about the feeling of frustration the poet feels in a bid to reconnect with his lost love. He resorts to the writing of poems and the recitation of it to help him deal with the absence.
However, this skill does not seem to do much for him as he ended the poem by asking what his fingers were doing writing the poems all over again. This is a rhetorical question (a question meant to stress a point rather than to demand an answer) that highlighted his frustration.
