Yorkshire Gamer
Cities: Skylines (The City of Shoreline)
One video went from 1,000 to nearly 7,000 views in five days. Turns out that it's on page 2 of search results for that video now, and it's been highlighted (as someone mentioned above) as a recommended video on a few big channels. Feeling good about it! Sometimes you need a stroke of luck! Subs gone from 300 to 740+ in under a week.