Purple lines this is expectable bb indicator movement.
Light blue is strong of 5 days movement.
1 blue - rise hight then light blue level, come back to level and then go up to 8500
2 reg - continue from part of blue
I wait for a tight bb channel which always predict movement ( purple lines ), i expect btc to enter the green channel, next is movement around light blue support line which will show where price will go.