Okay. Don't take any of this the wrong way, but you've been posting threads like this for a bit of time now. So i'm going to add my two cents to do what I can to help you out with two possible options:
1. TAKE A LONG, LONG BREAK.
This might seem counter-intuitive to what your friend said about getting started with your project on the spot, but sometimes you just need to completely clear your head of any ambitious projects and maybe pick up on another hobby in the meantime. If it means postponing Drachenseele for six months, a year, whatever, you need to make sure that you're not putting your eggs in one basket, which in turn, makes you ridiculously tired of anything your passionate about. Personally, I find it helps to do something else entirely out of the "arts and entertainment" arena such as fishing, sports, maybe creating a small business to gain fresh concepts about life outside of art that I can revisit later and incorporate into my works when the time is appropriate for me. I'm pretty sure that if you take some time for yourself, your audience will still be waiting for your next project, and will probably anticipate it even more.
Or
2. YOU REALLY GOT TO STOP COMPARING YOURSELF TO OTHER POPULAR WORKS, SERIOUSLY...
I get it. We all have our favorite franchises we in some form or fashion want our works to live up to. So we set the bar high (which isn't a bad thing), only realize expectation doesn't always equal reality. So here's a thought: who really cares? I see you trying to compare your works to Bionicle and Knack 3D, but why not start from the ground up and see where it takes you? Obviously you know the folks that created such works didn't get successful overnight. I'm pretty sure some of their early concepts were dumpster fire, and they had reasons for wanting to throw in the towel, but they didn't, and it worked out for the better.
If creating Drachenseele is really what you want to do, and you're willing to go the distance of making it 100%, you first need to realize that "You are not them" nor should you want to. This field is far too competitive and if you allow your mind to be overwhelmed, always checking the web to see "who did your idea better", you're not going to get anywhere. That's just what it is.There will always be someone who has your same concept, but had a little more success with it. So what? Good for them. Maybe it isn't as glorious as you wanted it to be, well don't hide it, let others be the judge of that.
And remember the famous quote “You can please some of the people all of the time, you can please all of the people some of the time, but you can’t please all of the people all of the time”.”