If You don't have credibility, success generally in life
I used to in the self improvement niche but then I realized this self improvement isn't a niche it's like combination of whatever many u can add which is horrible for someone who doesn't have credibility, experience. As a beginner to stand out You gotta niche really down n solve problems in that micro niche really well. (at least that's what I Observed in all the successful educational YouTubers like Hamza, @Andrew Kirby , Fireship.io (a coding channel) n heard alex hormozi n sam ovens say the same for beginner business owners.
I'm not successful so I could be wrong. Feel free to correct me