Guys, what's the cheapest way to get traffic now? I haven't been looking for what's going on in digital advertising world for about a year so my knowledge is a bit outdated

I think that for those who want to get cheap traffic, SEO is the best way. You'll have to be patient because usually the result isn't instant. But at some point, the traffic doesn't cost you anything. So I advise you to look at https://linklifting.com/ and some similar services more closely.