Investing in coins that YouTube channels talk about is a bad idea. No, it's a terrible idea. No normal investor would ever invest in a project just because someone on their blog said it's a really good coin.
the fact that most of the influencer nowadays are not serious when it comes promoting project and what they do is to keep posting click bait to gain viewers in order to have a good income as well, so it's definitely not a good idea.
For me probably it's a good idea to rely on the top 10 cryptos in the market and those projects that made good history in the previous run because surely after all you can obtain profits, even not 10x or less at least you've profits and your capital is in a safe place.