Digital Marketing Tactics: Sifting Through the Hype

I notice that there are many providers actively marketing their services for website submissions, social media engagement, and creating fake blogs. At the same time, I encounter a range of opinions on various websites, which only fuels my skepticism about whether these methods are truly the most effective ways to promote a website. As I delve deeper into these so-called services, my doubts about their actual contribution to improving a website's search engine rankings grow. I wonder if there's anyone who can shed some light on this matter. Or is it perhaps a case of "throwing everything at the wall to see what sticks," where if you spread your efforts widely enough, you're bound to hit the target eventually?

Digital marketing and seo are 2 opposite side of same coin.
Digital marketing is primarily paid traffic.
Seo is primarily organic traffic from Google.
To get a positive roi companies and businesses hire experts to run ads.
There are 10-20 things that will call themselves as digital marketing but if you can't run ads and get a positive roi you are not doing digital marketing.