Evidence-based recommendations on how to improve child safety (at least in the EU) are available from EDRi.
https://stopscanningme.eu/en/paper.html
From the executive summary:
This includes societal measures such as increasing access to welfare, mental health and other support services, as well as reforming judicial institutions and law enforcement authorities. Crucially, it also includes empowering children and teenagers to make sensible and informed decisions about how they act online by educating and empowering them.
National and EU institutions, services and authorities must enable this by ensuring that children and young people are supported and believed when reporting abuse, and that cases are pursued swiftly and with sensitivity to the young person’s needs, which are currently barriers to justice for survivors.
There are also many measures in existing legislation, particularly the 2011 CSA Directive, its upcoming revision, and the 2022 Digital Services Act, which will positively contribute to tackling CSAM, but which have not been (fully) implemented yet. The EU should also reinforce the network of national hotlines already leading the way in the fight against CSA, by ensuring that they have a legal basis for their work and more resources to carry it out.
Low-tech measures, such as ensuring that internet users can easily report abuse, can further help in the fight against online CSA. Implementing evidence-based prevention strategies will ensure that the EU’s approach tackles the roots of CSA, not just the symptoms. And by bringing all the right stakeholders to the table – children’s rights groups, digital rights groups, experts in tackling CSA, other human rights groups, and survivors – the EU will be able to develop sustainable measures that can protect fundamental rights, including children’s rights, and ensure a safe internet for all.