TORONTO — In a game of constant adjustments, Dominic Smith is trying to figure out his new role as a part-time player.

Smith returned to the Mets’ starting lineup Tuesday, after a four-game hiatus that could be partly attributed to a sore right wrist, but also manager Mickey Callaway’s preference to get Wilmer Flores’ bat in the lineup as much as possible lately.

It has created an obstacle for the 23-year-old Smith in his effort to show team officials he can thrive as the Mets’ everyday first baseman.

One line of thinking in the industry is the Mets might be showcasing Flores for a potential trade. Flores started as the DH on Tuesday and Callaway indicated he would likely return to first base once this road trip concludes.

“It was kind of weird because I never really sat for an extended period of time in the minors,” Smith said. “So [the break] was definitely a little different, but it was good. I got to just work on my mental approach, I worked on the mental side of the game and worked on some things with my swing and just took a lot of pressure off of myself and mental pressure that we can put on ourselves. I got to relax and just enjoy baseball.”

Smith struck out four times against the Pirates last Tuesday, and the following day received a cortisone shot in his right wrist. Smith said the soreness is something he plays through for a stretch every season.

Smith was limited to pinch-hitting duty over the weekend in Miami, but Callaway insisted that was more about wanting to play Flores than Smith’s wrist. Flores entered play 32-for-109 (.294) in 35 games since May 4. But the Mets also began the night 15 games below .500, well removed from any thoughts of the postseason.

“I think we just always need to check and see who is pitching against us and see how the guys are going, and Flo has been swinging the bat so well,” Callaway said. “Flo is going to need rest as well — obviously we have some days off coming up, we just had another one, so it’s just really kind of wait and see and just map it out to put the best lineup out there.”

Smith, who entered play 10-for-46 (.217), has played left field, but the Mets’ preference is to use him there sparingly. On the Mets’ previous road trip, Smith finished with five hits in the final two games.

“He was in a pretty good spot, driving the ball the other way, and we tried to build on that the last four or five days,” Callaway said. “We want to see him go out there, cover the plate, get on top of the plate and make sure he can drive that ball to the opposite-field gap.”

Smith was supposed to compete for the first-base job in spring training, but a quadriceps injury early in camp kept him sidelined for all but one exhibition game. Veteran Adrian Gonzalez won the job, but was released on June 11, partly because the Mets wanted to evaluate Smith.

“It’s still early, I don’t have that many ABs, but I showed signs and now I just have to be more consistent,” Smith said. “It’s tough not playing a couple of days or coming off the bench, because that was never my role. Just getting adjusted to that, it is definitely going to take a little time, but that is probably why my timing hasn’t been there and my swing hasn’t been there the last couple of games.”