For the examples, I’m using Lunar Heart, Shadow Bound (LHSB) (YA Fantasy at an editing standstill) and Between Roses (YA Fantasy self-published).
The first draft of LHSB I wrote for NaNoWriMo 2016, and Between Roses was NaNoWriMo 2013. So, since I’m a pantser, I never feel discouraged writing it because I know I can do whatever I want with it. It’s very freeing for me to just go for it. Wing it. Maybe even write complete and utter chaos. Be unhinged? Why not? I’m completely in control, so, no, I’ve never felt discouraged writing them.
I’m a pantser, and so, for first drafts, I don’t edit while writing, and it’s the way I’ve always written. Editing me will figure out what works and what doesn’t after the first draft is done.
For LHSB, yes, for the first self-edit. Then I got LHSB professionally edited, and then I had to rewrite it, and then I had to edit it, and then I went back and forth trying to come up with the perfect beginning. Now, well, it’s at a standstill. I’ve lost the plot
Long story short, I thought I felt better until I got it professionally edited. I started second-guessing myself.
But the professional edit was worth it because I realized I was not very good at showing character motivation.
Between Roses was a different story when it came to editing. I self-edited after getting reader feedback. Back and forth, back and forth. I just used beta readers. I also edited without the intention of self-publishing, at first. I did it slowly, over time. Honestly, this book turned out so much better than LHSB (got some five star reviews on Goodreads
) and I still need to figure out why 
I actually enjoy editing after the first draft. In fact, I’ve always enjoyed editing, period. Yeah, it might be stressful and tedious… but I come out of it at the end feeling 100% accomplished and satisfied. Maybe I enjoy editing because it feels like a puzzle and I love puzzles. I get to figure out what works and what doesn’t, reorganize my chaotic writing, and add in bits and pieces of lore to fill in plot holes. It’s like doing a jigsaw puzzle 
But yeah, I do get tired of it and have to work on a first draft of something for a while before I can do more editing.
I usually stick with something because I’m stubborn and don’t like leaving projects (with setting and characters I enjoy) unfinished. It bugs me. I will be returning to LHSB next year. Fresh start.
Between Roses, I stuck with it because I just genuinely enjoy the story. I love it, and so, I wanted to return to it and make it as great as I could on my own.
It’s always been fun and discipline
It’s always been me, pushing myself, stressing myself, and wallowing in my own misery. I’m just so determined to make a book. Between Roses proved to me that I can, indeed, make a book through sheer stubborn determination 
Hmm… probably “if you like it, other people will, too”.
It’s something I saw someone post on Instagram four, five years ago. It’s related to not being able to please everyone. Basically, you aim to write “a book you love”.
Because, think about it, there’s people who love the same movies you do, the same songs you do, and the same books you do. So, if you love your story, there should be people who love it as much as you do, right? 
I wish I had this mindset of “if you like it, other people will, too” or “write a book you love” early on". There’s an unfinished novel I wrote over 15 years ago. I used to like it, but then I started stressing about writing a book other people will enjoy. I stopped enjoying it and started cringing about it instead. It will never see the light of day.
Between Roses is a story that I love. I really enjoy reading it and sometimes I’m surprised that I was the one who wrote it
It’s so weird.
Writing this all out made me realize what I need to do for LHSB’s fresh start next year. I need to find the love in it.
Thank you for asking these questions
I hope my answers are helpful in some way. Feel free to ask follow-up questions if you have them.