For the SFF writers on here - you could put together a proper (kosher) online magazine that was free to anyone. Put it on a website and promote the crap out of it far and wide (not subscribers). Use the links to sell advertising [again] to pay for promotion in real-world magazines. It's something that would have a longterm effect, always there increasing SEO opportunities that would drive more traffic to you online. Continually paid for out of mutual budgets or paid ads. You have to see the market from a different perspective and be imaginative, then you can get ahead of the game. It's wide open.
Magazines require people and dedication. I run two indie-focussed promo sites, the Speculative Fiction Showcase (for science fiction, fantasy and horror) and the Indie Crime Scene (for mysteries, crime fiction and thrillers). We have spotlights for newly released indie and small press books and also have interviews, a weekly round-up of links of genre interest, a monthly round-up of newly released books, very occasional convention reports and the occasional guest post. I'd like to do more with both sites - add reviews, more essays/articles, maybe even original short fiction - but we're only two people with lives and writing careers of our own and there is only so much two people can do.
Also, a lot of indies have no problem blowing hundreds on BookBub, AMS, Facebook ads, etc... but balk at writing a guest post for a site that's free.
There also were quite a few promo sites, Bookbub alternatives, etc... run by indie authors. Most of them didn't last long, because they couldn't get attention.