First of all, it really depends on the trend itself. Some trends are only on specific platforms such as TikTok.
If you mean trends in general (NFT, crypto, AI, etc.) it is all about getting traffic and attention. To gather the most traffic/attention, you should try the following:
- create a website/blog about this topic (you can use the website as a landing page for whatever you wanna offer, that's long term and it takes time to get traffic and rank the website)
- post multiple videos daily about this trend on multiple accounts using TikTok, IG reels, and YT shorts. If just 2 out of 100 videos blow up and go viral, you will get a lot of traffic.
- Depending on the niche/trend Reddit can also be an extremely good source of traffic.
But the most important of it all is: You have to identify the trend as soon as possible and then you have to take action as soon as possible.
Imagine it is 2019, you would get into NFT, learn everything about it, start creating NFTs or offer any platform about it, etc. You would now be a millionaire if you would do it right. The same goes for crypto in 2014-2017. Or AI technology now.
Try to gather as much skills and knowledge as possible, and stay informed about the latest possible trends.
It is just a matter of time until the "next big thing" comes up.