Subs are pretty hard to get honestly lol. I'm at 99 subs rn, and was hoping to hit 100 before the next upload, but things are always really sporadic.
I'll go a while without any change and then get like three in one day and so on. It's hardest at the beginning though. You might get quite a lot of reads and very few subs, but then the more subs you have, the more you tend to get. it probably has to do with exposure, but it's still a bit confusing to me how many people will read SO many chapters but aren't subscribed. Still, I've seen it be the case for both of my series, so I think it's normal.
Currently, I get and average of like fifty views per day, which is like half my subscriber count. I'm not sure what it's like for other people.