When to call buy

I own this stock from a while back.
Not a lot but prepared to increase my holding from today.
I really liked the announcement today and given how SIP has traded long term indicates this stock is designed for slow and steady returns. The dirty rough patch in the middle was obvious reasons. The turn around has come and I place this in buy territory. Long term looks safe, steady.
Chart has formed strength and appears to be building momentum.
Key is quality, low profile, longevity, bright future.
Perfect summary, perfect investment.