Answer:
I would rewrite it in the following way: I am talented at writing, at practising sports, and at playing music.
Step-by-step explanation:
Parallel structure, also called parallelism, is the repetition of a chosen grammatical structure within a sentence. By making each compared item follow the same structure, you create a parallel construction. In the revised version of the sentence, each of the PPs is followed by a gerund (at writing, at practising, at playing).