No worries... I like talking football. Football is an international game. Before the pandemic started they had a Chinese National Football League, over 30 teams in Brazil, X-League in Japan with 3 different levels of players etc. etc. I would encourage you to look up the different Leagues on Wikipedia on your own time.
Advertising in newspapers only encourages people who read them. The internet is where people spend most of their time. Kids aren't listening to the radio as much these days. They watch Youtube and other internet stuff. When the Argos went to your kids school. What did they do? Did they talk to them about going to the game because if so that would grab their attention for five minutes and then they would tune out.
I would be impressed if they put the kids through drills and then demonstrated how the team went through drills. Obviously not tackle drills but throwing the ball through a hoop, running through rubber tire obstacle courses etc. Get the kids to lift some weights then show the kids how much they can lift. The other thing they could do is have the kids do tiktok videos and then put the best one on the Argos tiktok site. The kids would be excited by that and would tell their parents etc etc. For slightly older kids they could set up a CFL John Madden Video game League and have a tournament. Best players get to play someone from the Argos in front of the whole school. In the High School level they could organize a flag football tournament within the school and have members of the Argos play on the team. They could help coach high school football. Outside of school they could help out with charities etc. The Argos with the most charisma should obviously have a podcast for people to listen to if they have an interest.
Instead of advertising on the radio the Argos should team up with a radio station and get people to compete musically. you get a battle of the bands with people voting for their favourite bands or artists all year round sponsored by the argos then have the two finalists play at halftime.
If they do all that and still have no success it's time to hire somebody who has new ideas. But don't give up.