It all depends on the product you want to market and your targeting.
As
@Elchavo suggested - adult niche is cool because entry level is easy, you just need to make a hot babe account, follow bunch of people who also follows pornstars or onlyfans models and promote your stuff when they follow back to you. Absolute nobrainer. But as you already noted, it will be easy to get ban and you will need to work on a large scale to earn with this. That said, sex sells, and always will.
I would suggest trying to think of other niches you could target too, where you feel comfortable with the product you promote.
- find product
- make yourself look like expert of it
- think of the target audience
- try to reach that audience on twitter
For example, we can take any random product with affiliation possibility, or even just dropshipping.
A random thought: special GPS collar for dogs.
Create a Twitter profile built around this subject, add a friendly photo holding a doggo, and write an appealing bio and so on.
Then you just need to find a way to target all people talking about dogs, you can build a simple bots that listens for twitter feed and then replies to all tweets where a "dog" is mentioned.
You need a strong pitch, in this case I think scarcity is what could be used "You dont want to lose your dog right?" or "Have you thought about what will happen when your dog run aways from you?"
And then ask them to check your bio where your affiliate or dropshipping store link would be placed.
Easy as that.
Do this on a scale and watch orders rolling in and making you rich.