It's not just about making steps forward, because there's steps back as well, and those always feel more significant.
Only if you let them.
I know that sounds arrogant of me to say, but I only say it because I spent around half of my current life with that exact mindset.
"What's the point in trying when everything just turns out shitty anyways?"
"Why live when there's so much more bad than good?"
I grappled with questions like these for so long, and it eventually got to a point where I fantasized about ending my life in various ways on a daily basis for several years straight.
"Why not just end it now if I'm going to spend my entire life suffering and then die anyways?"
I would get so frustrated with myself that I was too incapable to go through with my fantasies... There's no cure-all approach that will work for everyone, obviously, but a concept that really helped me reach a healthier mindset was the idea that pain isn't this terrible thing that must be avoided at all costs to live a "happy" life. People can live through pain and grow from it, but only if they give themselves a chance. And yeah, that's easier said than done, and I don't know what you've been through before, but I know that both you and I have gone through some shit, and we're still standing here. There came a point where I just realized, "Hey, I can survive the torture of my own mind. I've done it for years. What is there to be so afraid of then?" Gradually things started to feel a little easier after that.
Every time she does something good, it comes crashing down at the end. Yes, she went out to a festival. That's great, getting out of the house is great. Then she got separated from her sister, and, upon reuniting with her, was humiliated.
So she got separated from her sister. No big deal. They were quickly reunited; nothing to worry over. And she was humiliated. In front of some random highschoolers and old friends from middle school that she almost never interacts with? Who cares? I'd argue that Neeko has four, maybe three, people that actually matter in her life: Her parents, Imoko, and maybe now Uri. And all of those people still love and support her, even knowing the things she was "humiliated" over in the first place.
That night Neeko had a ton of fun spending time with a person she loves and is loved by. There were some small bumps, but I'd say she's doing pretty good if she's still able to admit to herself that she was having fun (there was a few years where I was/am convinced that I hadn't felt any positive emotions in that time span, and felt isolated as the important people in my life were either coincidentally depressed as well, living very far away and in low contact, or deceased).
Well, that's a lot of rambling from me, and I hope it didn't come off as if I was trying to preach my beliefs, because that wasn't my intention. I'm not trying to belittle anyone's struggles, tell anyone to think the way I do, or anything like that. Rather, I just meant this as a response to the comments saying things like,
This manga isn't enjoyable
or
It's not funny for people that actually relate
Because I can relate some of my past experiences to Neeko, and feel like I can even relate to the present sometimes as well, but to me this manga has been about watching Neeko grow, and I think if you go back to the beginning and pay close attention, you will see that Neeko has been growing, ever so slightly but steadily. And I think that's because Neeko hasn't been letting her steps back be more significant. She does sometimes take some steps back, but overall her steps in the other direction have been even marginally larger, and in the end that's how you move forward.