For both 6,75 and TMIC, I hit 100 subs after about 3-4 months.
With 6,75, I already had some readers that moved with me from inkblazers after it shut down. I didn't do much other then uploading consistently and talking with other creators (as in, commenting in series I read, and checking out series of people who commented in mine). After that I had a very slow but steady growth, till my hiatus.
With TMIC, I had some readers come over from 6,75, but the growth was much quicker here, and I wasn't doing much more. Probably because it was a different genre.
I have to say, this way years ago and I feel like it was easier to earn subs back then? But that might be because completely different types of comics are popular now and mine might be just outdated haha
also my fault for neglecting my series for few years.