March Upcountry question

Hey GR members. I find it hard to find any kinds of books that I'm looking for and there are a couple of types that I'm REALLY hoping some people can recommend for me.

Number 1 desire is more stuff like David Weber's Empire of Man books. Essentially what I'm hoping for is people with future tech going to lands full of people with no tech. It could be time travel (taking tech back in time on Earth) or crash landing on an alien planet and working with the natives to develop new tech, or even aliens coming to earth and giving them new tech that way. If there are any books about aliens arriving during medieval times that would be even better!! Please, I'm really hoping there is more stuff like this.

Number 2 is books about the human discovery of FTL capabilities and the creation of new FTL ships and finding out what's out there. Endeavour by Ralph Kern, Grand Central Arena by Ryk E Spoor is great. What I want is not so much the FTL ship going on its first journey, but the actual journey of discovering and creating the tech involved, building the ship, selecting the crew and then going on the FTL mission. This seems to be something very difficult to find and I have no idea how to search for books like this. I'm really hoping someone can help me with this search.

Number 3 is a sci-fi / futuristic Vampire and or Zombie book (even sci-fi with an element of magic and space elves - yes I've read most of the Warhammer universe books they're some of my favorites). I want a Zombie book that is based in a space faring civilization, it could be an alien virus that causes the outbreak but seriously there has to be someone who's written about a Zombie outbreak that is smashing entire worlds. It could also be Vampires in space ships harvesting humans and both sides fighting or perhaps Vampires teaming up with humans to fight off an Alien invasion. Even just some sort of paranormal stuff like werewolves or ghosts or whatever fighting alien invasions or even being the reason humans get the ability to travel FTL. There has to be more of this. So far the only ones I know of that slightly fit this bill is Ex-Heroes, Galactic Mage, Deathless by Chris Fox.

Number 4, pretty much anything that's trashy sci-fi but SPACE battles with marines in power suits. Stuff like Jack Campbells Lost Fleet, Paul Honsinger, Evan Currie Odyssey One, David Weber Honor series etc etc. This is hard to make examples of because there's SO many and I've read so many like this but bring on the recommends I'm sure there will be lots of stuff I've already read but still.

I really wish sites like goodreads and IMDb had a proper algorithm that compares what you've rated books and movies and compares it to other people who have rated those books and movies similarly to you and therefore spits out other books that you will likely like based on your previous reading choices. They do to some extent at the moment but it's no good. That's an idea, I should try and write that algorithm it can't be THAT hard can it? I hate finishing a book or book series because I find it so difficult to find the next thing to read and there's SO much out there.

Anyway, please help! Much appreciated!