As someone who ran and still runs an after school TTRPG club I would say the first hurdle is basics supplies. Not just dice but pencils, paper, and the basic stuff is usally a bigger issue than content.
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The biggest issue is lack of public spaces. I had days of back forth to get the local library to allow play and to actual put out the source books I donated on the shelf.
I just wanted to say ... thank you! This is something I recommended on the first page.
If you're an older gamer (and that just means an adult!) one of the best ways to give back to the game and hobby that gave you so much is to pass it on to others. School clubs and libraries are two great places that you can make this difference.
And as just noted, sometimes you have to push a little. But the reward in seeing a new generation take it up is more than worth it!