Tylenol question (sick toddler)

Da

My son is almost 15 months his very sick has had a high fever of 102.3 and just looks and feels miserable all night and all day today anyways I been keeping up on the Tylenol doses for fever and he hasn’t gone any lower than 101.6 I feel like after this long the Tylenol should be bring it down more am I wrong? How much does Tylenol help your kids with fevers