As the other poster wrote, 100,9F is not particularly high. Here doctors recommend to keep fever below 39° (102,2F). When my child had the flu, we achieved this

As the other poster wrote, 100,9F is not particularly high. Here doctors recommend to keep fever below 39° (102,2F). When my child had the flu, we achieved this by alternating between Ibuprofen and Paracetamol in order to keep the doses low. All the best to you.