The wrong type of buyers:
The kind that want you to work for free. They will ask for endless revisions, making it impossible to deliver on time, and in turn downright destroying your delivery rate and on-time stats on Fiverr. They will also ask you to do more work than you originally agreed upon, and hold you hostage using the revisions-button. You can still offer revisions in eternity to the buyer, but make sure it comes as an order extra, paid for, and with added time to deliver. You can use the order extras to accomplish this.
Basically, the wrong type of buyer is people who will abuse you. Trust us “veterans” when we say you should remove that - most of us know from experience.
When it comes to your pricing it is difficult to say. I make websites outside of Fiverr, so I’m not too familiar with those gigs here, but considering you’re competing against hundreds, if not thousands of other sellers, who might be (at least on the surface) delivering the same service you do (it’s all about that first impression) at a much lower cost, I imagine you will have a hard time getting much business here on Fiverr to begin with. Once you have a few good reviews, it will be different. But it’s hard to decide on this. Do you want to sell websites for 10 dollars just to get the first sales, or do you want to not sell websites for 150 dollars. Finding that balance is really hard in such a competitive marketplace.
One thing I would do to improve your gig, is to get a good animator and a voice-over, and create a sexy explainer-video to hook your buyers. Having a professional video will increase your chances of getting orders.