I love Diluc as a person, hehe. And yeah, I get what you mean. I'm pretty sure I have both Qiqi and Keqing at C2 (maybe even higher?), despite never using them (though back when Keqing was one of my only 5*s I did use her a lot). Having all your favorites/core members at C0 is kinda heartbreaking. :(
And It's been like almost 750 days for me, I think??? :O
And I only lost to Jean very recently, 2-3 months ago, so it took me really long to get her, LOL
(I never pulled for 'Nari because I knew he was going to standard banner afterwards, and I needed to save for characters that came next, but every time I lose 50/50 to someone else my heart breaks further and further. I love that snarky, sassy man!

)