I'm New wI've spent a few years working on a hard-science fiction series on my free time. I've tried writing a few other stories prior but I keep scrapping them all because they never stuck out to me. Alas here I am, I finally have the perfect Idea, one I've wanted to do for eons. But there is this one issue I've run into that's really hurting my confidence and making me doubt my Idea. The overall world of my series is just too similar to a currently existing sf series that I happen to be a big fan of written by an author I admire. -They both have a grounded and realistic take on space travel, combat, and colonization of other worlds. -The technologies are too similar since i'm trying to make It as realistic as possible but cant exactly shake off the similarities in tech. -They both start with humanity being isolated at first but gradually incorporate an ancient-alien theme. The aliens are long dead and left some dangerous tech behind that could really change humanity forever. -They both have different factions trying to use dangerous ancient-alien tech for personal gain. -They are both heavily centered around politics. -They both have cultures which are a heavy mix of different Earth cultures. -The protagonist is a fugitive with good intentions looking to delve deeper in a conspiracy. -They both go in depth on the effect of low gravity on the human body. -They are both written in third person limited with different POV's but mostly center around one particular character. Though I am glad that there are plenty of differences, but they don't quite lift any of my concerns. -The ancient alien plots appear to be going in two completely different directions so far. Mine centers around possible past connections between humanity and these aliens, while in the other story it looks like the Aliens had no connection with humanity in the past. -The protagonist is a total sociopath and pathological liar, while in the other story the protagonist has a white-knight complex. -My plot is mostly centered around the mystery behind the protagonist and his psychological evolution throughout the series. The other one does center around the evolution of it's protagonist, but in a completely different way. -My story starts with humanity already colonized 15 different solar systems, while the other one is set only in our solar system, but later branches out to other systems. -I'm happy with how unique all of my characters are, they don't appear to have any similarities with the characters in the other series. There are some more minor similarities, but I don't feel like writing a novel's worth of words on this thread. At this point my story has become my baby. I don't want to abandon it or change anything drastically, but my motivation for writing is slipping down the drain. Have any of you guys come across a similar situation or am I just crazy here? If so, is there any advice you guys can give me?