If you like watching Steins Gate, perhaps you will enjoy watching durarara!! all season. Both show are slow paced at first and keeps interesting in later episode, but durara not involving time traveling. Also I suggest watching the Attack of Titan (perhaps you know it already), Kakumeki Valvrave (Gundam sister mecha anime, but more involved in conflict and politics), Kiseijuu Sei no Kakuritsu (Alien invasion on earth).
Also I suggest watching Tokyo Ghoul and Akame Ga Kill, though if you perhaps interested in Tokyo Ghoul, you better watch the anime and the sequel √A before reading the manga and it sequel :RE, or you may not enjoying watching the √A at all. Akame Ga Kill are the same, you better watch the whole anime first then read the manga.
Similarity of all anime I suggest is most of it have psychological genre like Steins Gate.
Many great anime are released in 2010-2015 era