Well, as someone from YT who has over 300+ videos, I can tell you almost none of them make any money after the first week.

YT's algorigthmn pushes your videos up to the top of the list if you have a lot of followers/likes/views in a short amount of time within a video being released. However, after a few days, once the views and the intial surge die down, your video gets pushed to the middle/bottom of the list. Meaning that when someone types in a phrase similar to what your video is, your video if it is 4 or 5 days old likely won't show up(unless it had hundreds of thousands of views, or not many people upload videos like it). For the most part there are always hundreds of people making very similar content who are in the high tiers of owning the phrases, such as "prank videos" or something. Those top few hundred people always are pushed to the top, but if they don't make a prank video for a week, their videosstart to de-rank.

YTis constantly looking for fresh consistent content.

On almost any of my videos I do not get more than 10 to 20 views on anything older than a few weeks(Ihave 5k subs and good search results too).

So it isn't too far off base for onnly being rewarded in a 7 day period that Steemit limits you to.

I do have a few exceptions, where some videos continue to do well because it is of a certain boss in a PC game that people want loot from and what not. But even those videos don't get more than a few hundred views extra/month and that is with a way larger population than steemit has(Ithink active 30,000 or so).

LBRY is probably better, but for the most part people don't watch older videos(Isay this in the macro term, like 95% or more of your views happenin in the first 3 to 4 days on YT).

Still, it would be nice to have continued earnings through another app as you say. Maybe as other have said, send a tip or something or someone makes another app.