The Mets moved out of last place in the NL East again Sunday when they completed a sweep of the Marlins at Citi Field.

Now comes a bigger test: actually moving up in the standings.

Facing a Marlins team that replaced them at the bottom of the division, the Mets won their fourth straight game — matching a season high — with a 10-1 rout.

The offense, dormant for an ugly stretch on the road, scored 25 runs in the series against Miami.

That production, they hope, follows them to the West Coast, where the Mets open a six-game trip Monday in Seattle, with three against the Mariners followed by three in San Diego.

“For us to get where we want to get, we need to play well here and on the road — especially with the position we’re in,” Carlos Mendoza said. “It’s an important road trip here.”

And that’s because the Mets at least woke up following a lost weekend in Miami just a week ago, when they were limited to two runs in a three-game sweep that went the other way.

“We’re showing signs of who we are as a team,” Mendoza said of a lineup that was sparked by good at-bats up and down the order, with the biggest blow a Juan Soto sixth-inning grand slam.

Even after this series, it’s hard to know just what this team is because just as they start to tease that they might right themselves, they fall off a cliff.

The Mets are just 11-18 away from Queens and have lost seven of their last nine on the road and it likely won’t be as easy in Seattle as it was against these Marlins.

On Sunday, they took advantage of Miami, loser of five in a row, being forced into a bullpen game when scheduled starter Janson Junk was scratched and put on the injured list with right shin inflammation.

Nolan McLean, coming off the two worst starts of his young career, gave up just one run in five innings, but he walked a career-high five batters — and hit another — in his 94-pitch outing.

It didn’t take the Mets long to pounce, as Carson Benge hit a home run to center to open the bottom of the first.

The 418-foot shot was the rookie’s first leadoff homer and came against lefty John King, who was used as an opener.

It was also Benge’s first homer against a left-handed pitcher. He’s put up impressive numbers so far versus lefties, with a .757 OPS entering Sunday’s game.

Marcus Semien greeted Miami’s next pitcher, Anthony Bender, with a two-run shot in the second.

The Mets added to their lead in the bottom of the fourth. They loaded the bases with two outs and Luis Torrens singled through the right side to drive in Ewing and Brett Baty for a 5-1 lead.

Soto’s grand slam in the sixth put the game away. It was the only hit in the inning, as the Mets walked four times and Torrens was hit by a pitch.

“I feel everybody knows what to do,” Soto said of the offensive turnaround. “We have a plan we executed through the whole series. The whole lineup came ready to attack and we attacked as a team.”

Soto has stayed hot, with nine homers in his last 15 games. That’s the most in the majors during that stretch.

And with a bullpen game set for Monday in Seattle, David Peterson’s ability to throw four scoreless innings to finish the game sets the pen up well.

Of course, the Mets thought the end of their previous homestand would alter the course of their season, when they took two of three from the Yankees in the Subway Series.

That didn’t happen.

“The way we set ourselves up this year, we need as many wins as we can [get],” McLean said. “There’s definitely some good momentum.”