Decline in views is normal, and not a reason to be discouraged.
Heck, on one site, one of my stories has views that are all over the place for something less than a month old - chapter 1 had 33, two had 17, then 10, 16(!), 9, 12, 13, 11, 10, 7 and 7 in that order.
People usually read the first...