Option 1: run for office yourself. But it isn't an easy thing to do, regardless of what your positions are in all other issues and whether it's feasible for you to enter a party with a chance of winning or running an independent ticket.

Option 2: lobby elected officials. However I doubt it will be a priority for them. It will definitely be used against them as pedo apology even though it really isn't. Hyper free speech parties are your best choice, such as Libertarians in the USA or Pirates in Europe. But even them are not a sure bet.