Sleep Training with Minimal Crying it Ouf

i have a high sleep needs 8 month old.

From 2 months to 6 months, he slept through the night from 9 pm to 6:30 am, fed & went back to sleep until 8 or 9 am. He also used to be able to go down drowsy, fuss for a few minutes & fall asleep when i came back in once to pat his back for a little(he was