Kirby's original run was cancelled on issue 19, and that's the longest Eternals series to date. After that, Marvel has tried everything to get readers interested in the concept and nothing seems to stick. In 2003 they even put out a gritty reboot with HBO levels of nudity and gore, but not even the promise of boobies on a Marvel comic could push the series past six issues.
Marvel Comics
In 2006, Marvel hired author Neil Gaiman (who knows a little bit about comics starring inmortal deities) to re-reboot the franchise with a much-hyped miniseries. The resulting ongoing series was cancelled on issue 9 despite a desperate attempt to save it by prominently featuring the one thing Marvel fans find sexier than naked breasts: Canadians with knife hands.
Marvel Comics
By 2018, the Eternals were so irrelevant to the Marvel Universe that all but one of them were killed off between the panels of an Avengers comic (the last one died one page later). Meaning that, when the movie was announced, most of the Eternals had last appeared as corpses laying in the background. Presumably they'll be doing more than that in the film, though we have to admit that "corpses laying in the background for two hours" would be a pretty original twist for a $200 million dollar production.
Marvel's current Eternals comic seems to be doing well, but it's too early to tell if it'll end up succumbing to this franchise's overall stink. The core problem is that, again, Kirby wasn't particularly inspired when he came up with these guys. Unlike the New Gods, who are distinct both in looks and personality, the Eternals sorta blend together -- except maybe for the one who joined the Avengers because she was horny for Captain America. Now, that's not to say that there are no redeeming qualities whatsoever in this series ...