When the Celtics returned from Philadelphia early Wednesday morning, Payton Pritchard was stewing.

He had just played his worst game of the young season: five points, three assists, three rebounds in 31 minutes in a 102-100 loss to the 76ers. He’d also managed just five points two nights earlier in a win at Orlando.

Over those two games, Pritchard took 17 shots and made just four of them. Nine of his 11 3-pointers missed their target, exacerbating a problem that’s persisted for Sixth Man of the Year-turned-Celtics starter since the season began last month.

The misses began wearing on his psyche. He fell into “a funk, mentally.”

“I was very disappointed with myself these past two games,” Pritchard said. “Kind of down in the dumps a little bit. Just overthinking the last two games. Every

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