If it makes you feel better, I only have 130something subs total, and Only have gotten like 25 total over the last couple weeks. Granted I'm a different genre, but yeah it hasn't been picking up either.
I just remind myself that it is not a competition with other artists, it's a competition with myself. Atleast for me, the goal is for self improvement. So I try not to focus too much on the numbers and just do what helps me improve.
But I'm interested to see what suggestions other people have to help pick up subs, because it is nice to have more subs. I'm social media stupid, so I've got no advice for you, sorry.