What tends to happen if you get good amount of watch time from the suggested videos source, is that YT will also start to feature your video on the YT homepage (I assume in the suggested tab on the homepage itself rather than from suggested videos on another video's side-bar).
Getting latched onto a popular video often ends up being a double whammy, because you get promoted by YT in two ways rather than one.
It can increase growth at a ludicrous rate if you want to capitalize it, because if your video gets a few dozen thousand views in this manner, it will often splash some views over into your other videos, perhaps even your very next video, which could then itself get snagged onto the homepage by YT's promoting algorithms.
Of course if you make varied content or don't want to try to purposefully coast off your popular video at the moment, the momentum can come back down to a halt. If you're into YT for the $ you wanna do everything you can to get as much traction going as possible. If you do YT mostly for fun, you can just look at such events as pleasant surprises and keep doing what you always do.