Data science is not some of my specialities but my few cents to this topic are:
- How good is the data quality? I haven’t had a look on how the information is gathered - just out of posts in your linked forum topic? Is it all valid, no doubles, etc.?
- The timeframe is maybe a bit too short to make a valid prediction
- Keep in mind such things as CPU shortage, Chinese New Year, etc.
My personal opinion, it looks linear.
Edit: I think it could also be interesting to plot the monthly shippings (not cumulated)!