Play basketball. Seriously. If your parish has a gym, make one or two nights a week open for guys to come play basketball. Our parish makes it for 18 and older (safety reasons - not sure if that’s for the teens who might get sent flying by the bigger guys, or for the older ‘geezers’ who might have a heart-attack if they tried to run with the teens - but I digress).
How does it work? Guys A, B, and C attend parish X. They hear they can play on Thursday nights for free or low cost (I think ours collects $2 to help with the cost of lights/heat). They come - and they invite Joe, Bob, Harry, and Sam - who may or may not be Catholic and/or attend mass. Other guys in the parish hear about it, sounds like fun. They come. Wife reads about it in the bulletin - mentions it to hubby who’s been thinking about getting into shape - he ends up going. Each of these guys invites a another guy or two. Now you have too many guys to play continuously so they take turns. While resting/waiting on the side, they talk. More friendships/buddy-ships form. They are sitting on church property - sooner or later, mass / father’s homily / coffee&doughnuts / KofC /etc. is brought up. Guys who are attending mention this stuff. Guys not attending / feeling a smidge guilty about it / show up on Sunday. Before / after mass they see those same guys they play ball with. They get greeted by name - they KNOW someone there. More ball playing, more talk, more discussion of homilies, raising kids in the Church, etc. Positive peer pressure grows and blooms. Guy from the couch becomes regular attendee at mass. Guy who went once or twice makes sure to show up for mass because he wants to catch his buddy afterwards to give him the article he had mentioned when they last talked. Another guy attends and joins K of C after being invited by his new buddy from bball. When a guy doesn’t attend the next mass, he may hear “Hey, Missed seeing you Sunday”. Realizes attendance at mass does matter - at least to his friend

Makes an effort to attend more often, then it becomes a habit.
I repeat - play basketball
FYI - Above is based on true life experiences witnessed and described by myself, my hubby and others in my parish. Doesn’t sound very religious based, I’m sure. But my view is you have to start with where guys are - and many are not turning over great spiritual and theological thoughts in their heads. They are trying to work, raise their kids, pay the bills, keep their spouse happy, and get the grass mowed. They aren’t bad guys. They just aren’t focused on religion - this stimulates their awareness and gets them motivated a bit - once they are attending, then the homilies, the graces, the sacraments can start kicking in

Anyway - my real life positive idea to get men back to Mass.