1: Yes, dropping off is completely normal
2: I only work on one game, even though I have 13 projects.
3: This is mine *Weekly views*

Timeline:
Release: Late February: Some botted views involved, so off the graph.
April: Few views, no marketing
May: Itch.io community.
June - July: Consistent Marketing, lucky community post (~5k views on a release announcement that was not mine)
Early August: r/GameDeals and 50% off
Late October: Itching for Games 3
*The download metrics are not accurate
No money spent on ads, Steam releases, or followers.