'Trust me, I'm a chemist' is by far doing the best, despite being the one I put the least effort into
I guess it's a charm of a gag-a-week comedy/slice of life comics. It has the most subs out of my all series, and also it is still regulary getting some views, despite not being updated since 2018. Not A LOT of views, but not much less than my ongoing webcomic on a monthly basis.
Second one is 6,75, my completed fantasy webcomic. It's not getting much attention now that it's completed, but it still has some views from time to time and it gathered a decent number of subscribers over the time.
Anddd the third one is Haunted House, a mystery / supernatural / horror(?) webcomic I started posting in October. Doesn't have a lot of subs and I feel like it's harder to gather viewers' attention now then it was when I started 6,75. Still, I'm not complaining, as I get a regular feedback/comments from my readers on tapas or other pages and it's motivating to know that they care about the story 