 If you liked Watashi ga Motenai no wa Dou Kangaetemo Omaera ga Warui! |  ...then you might like Osomatsu-san |
The more neets, the merrier. Just like Watamote, Osomatsu-san is about a group of neets trying to survive in today's society. Which leads a to similar comedy style, where you just laugh or cringe at how stupidly hard it is for them to integrate in society.
The main characters are very lookalike: they're awkward and so their goal is to become popular. They also share the same hating for "normalfags". The two series are also very similar in themselves, as they're both comedy with some cringy yet sad moments. Also, they're both sadly relatable.