PHILADELPHIA — As dramatic as Michael Conforto’s drop-off was in the season’s first half, his rise in the second has been even more pronounced.

The Mets outfielder has regained All-Star form in recent weeks, with his best work coming Monday night when he drove in a career-high six runs in his team’s 9-4 victory over the Phillies at Citizens Bank Park.

Conforto capped his night with a three-run homer in the ninth that gave the Mets plenty of cushion in snapping their two-game losing skid. The homer, against lefty Austin Davis, was Conforto’s 15th since the All-Star break and gave him 26 for the season. Conforto also has 10 homers against lefties. Such totals seemed unlikely earlier this season as Conforto struggled in his return from surgery last September to repair the posterior capsule in his left shoulder.

“The first half was tough, not just for me, but for the team,” said Conforto, whose 22 RBIs in September are a career high for any month. “Everybody at this level is going to work until they figure it out.”

Conforto delivered an RBI double in the seventh that snapped a 4-4 tie and gave Zack Wheeler the support he needed for the win as Mets officials now mull whether to skip the right-hander’s final two starts to avoid overextending him. Manager Mickey Callaway and pitching coach Dave Eiland plan to meet Tuesday with Wheeler to discuss the possibility of a shutdown.

“I’m still feeling good and my legs are under me, so it’s something we all have to sit down and talk about,” Wheeler said. “But I will leave it up to those guys.”

Wheeler (12-7) overcame a sloppy fifth inning in which he allowed four runs (two hit batters contributed to the Phillies rally) to reach a career high in wins. His previous high was 11 in 2014, when he pitched a career-high 185 ¹/₃ innings before missing the next two seasons rehabbing from Tommy John surgery.

In his return last year, he pitched 86 ¹/₃ innings before he was shut down with a stress reaction in his right arm. This season he has pitched 182 ¹/₃ innings.

The four runs Wheeler allowed Monday were his most since July 14. Since then he had pitched to 1.32 ERA, the second-lowest figure in the major leagues, entering play, since the All-Star break.

But Wheeler watched his chance at another gem unfold in the fifth, when J.P. Crawford delivered a bases-loaded triple.

Ex-Phillies manager Charlie Manuel, now a consultant for the club, presented David Wright with the “NYM” panel from the out-of-town scoreboard at Citizens Bank Park.

Wright, is continuing workouts for his activation from the disabled list on Monday at Citi Field before the scheduled final start of his career on Sept. 29.

Last weekend, Wright was given a No. 5 placard — representing his uniform number — from the Fenway Park scoreboard.

The Phillies presented longtime Mets media relations director Jay Horwitz with a cake during a brief pregame ceremony in the press box. Horwitz will move into a new role after this season, as the team’s vice president of alumni relations. Sylvia Green, the widow of former Mets manager Dallas Green, was among those who attended the ceremony for Horwitz.