How to extend naps?

KD

My LO will be 5 months old tomorrow & is still like clockwork when it comes to napping. He can only stay awake for 60-90mins & naps for 37mins EVERY SINGLE TIME. So how can I work with hi. and extend his nap time? I’ve tried keeping him awake longer but he becomes inconsolable & overtired so putting him down for a nap SUCKS. Any tips/tricks?