SAN DIEGO — Bo knows small pockets of success, but how about helping to carry this Mets lineup?

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Such is the challenge facing Bo Bichette, as his team — anchored by dead weight — has sunk toward the ocean floor.

The Mets began play on Friday ranked 29th in MLB with a .652 OPS and Bichette’s underperformance, as a centerpiece of last winter’s lineup overhaul, has contributed.

The Mets got a small taste Wednesday of what a productive Bichette means: His 4-for-4 performance was central in the team’s 7-1 victory over the Mariners.