1.) When you're down in the dumps, how do you get your love and motivation to write back? I don't know if depression has literally chewed me and spit me back out once all of the flavor went away, but I feel like writing is such a CHORE. I look back at my old stories and work and I can't help but envy my past self because I was (or, I think at least) a very skilled writer. I get these small bursts of a desire to write that eventually quickly simmers away. I know if I start a new story I will write one post and say "I am done. I can't go on with it anymore." I want my desire to come back, the excitement, you know... :[
I was somewhat like that. For the longest time, I liked having posts out that were good quality but never enjoyed the actual process of writing said posts. I'd think of a plot, really feel like I want to write it because I could craft something beautiful, but then when I actually do start writing I'll feel like I'm working rather than enjoying my time with a hobby. I remember thinking that I'd rather do anything else with my free time. My posts would take an average of 1-2 months, and then when I'd summon enough will to write them, I'd still post something rushed and typed in an hour. I was also wrestling with depression at the time. I didn't really enjoy my life, and that was reflected on my enjoyment of writing.
What helped me was taking a break. For around 2-3 years, I barely wrote anything on BMR. I'd still keep slow RPs that never took off, but I mostly browsed the place to respond to graphics requests and banter once every blue moon on the discord server. During that long-ass hiatus I'd frequently update my RT with ideas and plots but never really bump it. When I got back from my break I was rejuvenated to write again. Having absorbed a lot of inspiration from movies, shows, games, books, and song that I'd been exposed to through out my break, I had a lot of ideas to turn into stories.
One source of inspiration for me was that I started experimenting with completely different aspects of eRP. Originally, I'd mostly write seductive vixens in consensual stories. I'd written a bit of FxF and some eccentric characters here and there but mostly I revolved around the same theme: strong, sexual, hetero female characters. After my break I started drawing with new crayons. I threw myself into BDSM stories, dub and non-con pairings, snuff, femdom, MxM, etc.. I think the change really helped me rekindle the passion alongside the extended break.
If neither of these two ideas look attractive to you, Ironic, I recommend you focus on the aspect that you enjoy about RPing. Do you like writing, but not enjoy the commitment to specific time-frames and standards? Do you enjoy writing in small bursts, like you said? I think you could it fun to write a solo story. Whether you post it publicly in the stories section here or keep it in your PC, I think it could be a perfect way to enjoy writing, and not feel bad when you take a breather after every piece.
2.) What inspires/motivates you into writing an original plot idea? It seems that I base my ideas off of previous stories or movies, anime, shows, pictures/art, and books. I don't know if I really came up with an original idea without taking a piece from something similar. What steps do you take in creating the perfect setting, genre, etc? I'd love to hear.
There is nothing wrong with using other works as inspiration.
In any case, to create your own story you either approach it as an engineer (plot-driven stories) or farmer (character-driven stories). The analogy here is that as an engineer, your characters are tools. They're there to serve a goal in the grand plot that you have. You're after the plot, and they're pawns in it, affected by it, and only affecting it in a purposeful way (as in, they were created, originally, to affect the plot in this specific way) just like how an engineer uses their tool. I think Game of Thrones is a perfect example of this. As a farmer, you plant the seeds and watch the plants grow. You create the characters and throw them in a world, and then ask yourself "what would they do" and then go from there. The characters make decisions, reap the consequences, and evolve from the results of their actions. And in enacting their decisions, the story progresses. The plot evolves in both styles, but the characters in the plot-driven stories are swept by the current that is the plot. However, in character-driven stories, the characters' actions steer the current. Breaking Bad and most Quentin Tarantino movies are good examples of character-driven stories.
I'm really bad at explaining things, and that is merely my own take on it, but there is plenty of articles online that describe this in a better way and offer insight on how to craft a plot from scratch. I think the most immediate way I could think of is to create a character type that you find fun to write, and then give them a motive or a goal, and then see how they'd go about achieving that goal.