There is only really social blade as the permium youtube tool. Other than that, just subscribe to all the channels, in the niche that you are in, and make a spreadsheet of them. Don't underestimate the power of a spreadsheet, with YOUR data on it. Still more powerful than any AI.
I have a spreadsheet with X amount of wojak channels on them, cause thats my niche, if anyone makes a new new channel, or similar type of animations, i know about it, cause its my job to stay upto date, its your job to understand your niche, and what you can do.
(Hopefully your not just looking for a trend first, instead of being active in the sector? You can't easily jump on a band wagon compared to others who are building and riding it in the first place. Yet you can pivot existing creations to suit other popualr themes, thats a whole different, and easier story.)