Honestly I think the best solution would be what ISPs used to do. They would bundle basic email and usenet and web page with your monthly internet access account. You could pay extra if you needed more, either to the ISP or to a specialist provider. The ISP also helped you connect so non techies could still use email etc. More expensive providers like AOL would provide chat and forums too.

But we've stripped internet access to data access, basically web site loading. I don't think you fix it though because you have to be pretty techie to understand why you'd want a non ad based email provider, forget about why you'd want lemmy / fediverse or usenet, chat etc.