You don’t look like an outlier to me. Slow is OK. This is not a race but a marathon. The important part is do you have a consistent routine? If you follow your routine consistently everything is going well.
your stats say that you’re taking a month per level (typical level-up), that isn’t really an outlier. i’ve seen several posts since i’ve been here (beginning of the year) where people reached level 60 after 5 years.
on the other hand, 705/15 says 50 days per level, don’t know where the discrepancy is coming from. did you perhaps have a long break somewhere?
but as the others said, it’s not a matter of speed ^^