7 months old, dropped 3rd nap - SO tired in pm

[owltrousers]

DS has just turned 7 months. From ages 3 months til now he's had 3 (1 hourish) naps a day, pretty much like clockwork. Now he has suddenly switched to two much longer naps (1.5-2 hours) which is great! except he naps at 8-10am and then again at 12-2pm which means he is awake from 2pm until his bed time at 6.30pm and he's miserable and rubbing his eyes by 5.

Any tips on what to do, how to stretch out his day? Would love to hear from anyone with experience of nap dropping at this age.

Can you try and delay the first nap for half hour or so which knocks on the rest of the day? What time does he go to bed? Could bring that forward by half an hour until he can cope with slightly longer awake time in the afternoon. Or go out after 2nd nap and he could have a 20 min cat nap in the car on the way home?