Crypto has nothing to do with your case of blackmail, it was just chosen as a means of payment. Regardless of this case, I guess you should always have the money "in your hands" first, and only then negotiate any deal. Closed account, broken phone... all sound like bad excuses.
And did you think that this is a good account for the promotion of one of your services unless you sell sex toys?
There aren't many tips and tricks here, and no one can tell you the secret formula in one sentence. Be active on Twitter, make interesting posts and develop your account. You can also post pictures of a beautiful girl, it will certainly help, but such followers will probably not be interested in your services.
Also, maybe it's a guy, but I just assumed its a girl based on the photo.
EDIT: she has posted. I no longer have any complaint with her.
Then change the name of this thread or add something like [solved].
It should remain as a reference for other users, as it should be how not to arrange promotions on Twitter.