If you liked
Muteki Choujin Zanbot 3
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...then you might like
Devilman: Crybaby
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Devilman's original manga sent a ripple throughout 70s anime, even as the actual Devilman anime was very different. Crybaby accordingly feels like a blend of 70s sensibility with modern. Zambot 3 is one of the best reference points for undiluted 70s-ness and shows major influence from the Devilman manga. Devilman Crybaby and Zambot 3 share a love of cartooning and black comedy— and deal with with similar apocalyptic horrors and "war is hell" themes.
If you liked
Chou Denji Machine Voltes V
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...then you might like
Muteki Choujin Zanbot 3
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Among 70s super robots (both released 1977) Voltes V and Zambot 3 stand out as particularly serious and dramatic. They both execute on their premises so well that they remain worth watching today. Voltes V is the less cynical show and is a relatively "straight" example of a monster-of-the-week super robot show, but its melodrama is executed so well, it adds a lot of weight and staying power to what could've been disposable entertainment. Zambot 3 takes the same tropes Voltes V treats seriously but deliberately over-commits to the seriousness to the point it generates subversive black comedy and a very different flavor of drama. Both work wonderfully, even though their genre was so new at the time. Also both shows involved Yoshiyuki Tomino shortly before the release of Gundam— though in different capacity (Producer for Voltes V, creator and director for Zambot 3).
If you liked
Yuusha-Ou GaoGaiGar
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...then you might like
Yuusha Keisatsu J-Decker
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J-Decker does the same kiddy SatAM aesthetic as GaoGaiGar very well. The difference is J-Decker is less focused on being an action series; it is, odd as it may sound, the more cerebral sci-fi show. There is a constant undercurrent of sci-fi in GaoGaiGar that mostly serves to prop up the action. J-Decker takes the same sci-fi as a way to explore characters. Super Robot action results in both cases, but with different sorts of stakes at play. J-Decker is like GaoGaiGar if GaoGaiGar had less Gai and more Mamoru and if it gave the Ryuu-bots more time to develop as characters. In the end it has a lot of the same flavor as GaoGaiGar, but in different balance.
If you liked
Tengen Toppa Gurren Lagann
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...then you might like
Shin Getter Robo
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Gurren Lagann and Getter Robo are constantly compared, but to put it really concisely— Getter Robo is Gurren Lagann, minus comedy, plus horror. They're similar enough if you like one you'll probably find something to like in the other, but different enough they can have fans with entirely different sensibilities. Getter Robo's influence on Gurren Lagann is both intentional and extremely obvious to anyone that's seen both. Gurren Lagann keeps a lot of the horror-ish elements but downplays their scariness. Getter Robo wants to tell stories that are far darker than Gurren Lagann. New Getter Robo is by far the easiest version of Getter Robo to consume as someone who's never experienced the franchise before, and makes both the similarities and differences with Gurren Lagann— both incredibly substantial— very apparent very quickly. ("Shin Getter Robo" is a legitimate way to put the title, but it also could refer to a very different manga or even the title of other OVAs, so this OVA gets called "New Getter Robo" for less ambiguity.)