There’s no changing the fact that the Mets are going to miss the playoffs and could even finish in last place.

But on Sunday, Pete Alonso reminded people of the talent the team has as he continues to put up numbers that few Mets have ever approached.

Alonso powered a 6-3 win over the Mariners by hitting a pair of homers at Citi Field and the performance gave him 41 homers and 100 RBIs in what has otherwise been a dismal year in Queens.

The first baseman became just the fifth player in MLB history to hit 40 home runs three times in his first five seasons in the majors and also became the fourth player in Mets history to top the 100-RBI milestone three times.

“It’s kind of wild to think about,’’ Alonso said when asked about his career accomplishments. “It’s happened so fast. It seems like yesterday I was in my rookie season. It means a lot. This place has been extremely special to me.”

And when told the names he’s now associated with when it comes to the home-run milestone, a list that includes only Ralph Kiner, Ryan Howard, Albert Pujols and Eddie Matthews, Alonso had a simple response: “Holy s–t.”

As for the Mets’ RBI mark, he joined Carlos Beltran, David Wright and Darryl Strawberry.

Whether he remains a Met and builds on that legacy will be determined before he becomes a free agent, which is set to happen after next year.

Francisco Lindor said despite Alonso’s accomplishments, he’s not surprised the slugger has been mentioned in potential trades.

“We’ve all been a part of trade [speculation],” Lindor said. “It’s gonna happen again. It’ll probably happen to me.”

As for whether he believes the Mets will ultimately keep Alonso, Lindor said, “I would hope so.”

For now, Alonso is doing it all as a Met in what’s been a wildly disappointing season for the team, which heads to Washington to play the Nationals on Tuesday in a battle to stay out of the cellar of the NL East.

Their ugly record hasn’t had an impact on Alonso, who has put up the gaudy power numbers despite also dealing with a wrist issue for part of the season.

“Regardless of what’s happening externally, it doesn’t change my job,’’ Alonso said of how he’s been able to remain locked in despite the team’s non-existent postseason hopes. “I do whatever I can to help the team win. I know where we’re at in the standings. It’s definitely not ideal. It’s not where we thought — or anyone thought — we were gonna be at this point. It doesn’t change my job. It doesn’t change my intent or my intensity every day.”

That’s something Buck Showalter has noticed.

“Through thick and thin, I know one thing: Pete is gonna walk through the door the same guy every day,’’ the manager said. “He never has a bad day, cares about his teammates [and] cares about the Mets.”

Despite the fact the Mets came into the weekend set against the surging Mariners having lost six of eight games — and Seattle having won 13 of 15 — the Mets played well in sending the AL West-leading Mariners to their second series loss in their last 13 series.

They also got a home run from Jeff McNeil and more encouraging play from rookies Ronny Mauricio and Brett Baty as they won for the third time in their last four games.

And there was heads-up play throughout, including in the bottom of the first against right-hander George Kirby, who went to Rye HS in Westchester, and who allowed four runs in just three innings.

Lindor reached on an error with one out when second baseman Josh Rojas booted a chopper and Lindor then scored on Alonso’s single to right-center that was played with a complete lack of urgency by star center fielder Julio Rodriguez.

“They played with great effort at a time when some people would have given in,’’ Showalter said.