So our pedi suggested layering Tylenol and Motrin when the fever is that high. You can give them overlapping since they aren't the same medicine. Tylenol (acetametaphin) is every 4 hours and Motrin (ibuprofen) is every 6 hours. You can time is so that they always have something in their system as the other one starts to wear off. We do this for 2 or 3 days until his fever comes down.
I also let him play in basically just his diaper. I try to offer liquids more frequently in smaller doses since he wasn't drinking as much when his fever was high. I let him play in the bath (lukewarm- you don't actually want to put them into a cold bath) for a long time.
FWIW, DS was 7 months (ish? can't remember exactly) when he had a 104-105 fever. It's super scary. Hope Tiny gets better soon!