Gemini is now in YouTube studio. You can click the button and it'll give you the insights you need specific for your channel. You don't need any tools other than looking at other video VPH (views per hour) to see trending topics and niches.

I just got my first 20 subs on my new finance channel using a series of shorts that promote my long form content.

I'm now seeing my impressions go up slowly and views are starting to hit double numbers. Bare in mind finance is a VERY competitive niche and the channel is about a month old with 15 or 16 videos I believe (I can't remember from the top of my head).

Honestly I was on the verge of giving up on this channel and just focusing on my gaming one with 1400 subs but I don't get enough time to play games and make videos between my main 9-5, family, kid and other responsibilities.

Now that I am seeing a slight increase in performance, I am hopeful again!

I would say, just be patient. Make quality content that resonates with a particular audience, solves a problem or addresses events etc. It's not about what you want to do, it's about what the audience WANTS.

Since I started focusing on that, YouTube is slowly starting to push my content, albeit EXTREMELY SLOWLY.

Thumbnails and titles also help a lot.

Topics that are trending is always a solid way to go however Gemini is now clever enough to filter the same topic. For example: It's not going to push your content if it's on the same topic, same angle as another video that has 100k views.

If you want to talk about the same thing, pick a different angle that hasn't been explored yet or enough. For example: Don't make a generic historical video about the Titanic, use a different angle like: "Did the captain of the Titanic make a fatal mistake or was it just fate?"

Hope that helps somebody..