I identify with a lot of you. I'm a VN semi-newbie, I've known them forever but haven't finished... or read many for too long. Picked up the hobby seriously last year. I wasn't motivated enough, and I have some problems that make me lose concentration/energy.
Anyway, yeah, I hate dropping VNs too, but then, I don't want to force myself to continue, even though in my mind, I should, because people say X thing is amazing, and "OMG, you've got to experience all the endings!"
I do that thing too where I keep trying new games because I get bored. The filler also gets annoying. I dropped Yume Miru Kusuri in 2014 because it was too repetitive, too much filler. I also got into a different route that I wanted, so I gave up. Giving YMK another try after all these years and I still have the same complaints. It's also a bit unrealistic.
I don't actually like 100% completion, it takes too much time and in the case of VNs, I get attached to a certain hero(ine) and trying another one would be "cheating", in a relationship sense. It feels like I'm betraying the character, lmao. I try the routes that interest me, not all of them (unless there's no other choice). In some games there aren't even many differences between the routes anyways. The skip function is good but sometimes you have to hold the button for 10+ minutes lol.
I haven't played Deardrops yet, however I am liking Kira Kira which is by the same developer. I'm kind of reading a ton of stuff at the same time though, so I'm progressing slowly. I am all for music themes since my main hobby is music, so yeah, if you don't enjoy the main themes, then you'll probably hate the whole thing, I guess. I try to avoid what I probably won't like, although I need to get out of my comfort zone. For example, I'm not into mecha but I will probably read Muv Luv at some point. Art should draw you in, not make you uninterested.
Try what seems cool to you, don't trust the hype, if you do, you'll probably be let down. Expecting too much of something can prove to be a bad thing. I was terribly disappointed with SubaHibi and I gave up on it.
P.S. I am considering Koichoco but I heard the characters can be mean, is that true? Fureraba seemed nice but I've seen complaints about the TL lol.