So, there is loads of info dotted around here on how to make an appealing advert. There is also so much info online for marketing as a general term, but everyone here is right: get yourself an eye-catching photo (no offence to anyone here but I constantly hear clients say they are put off by full nudity or "vulgar," poses - but I suppose this depends on the type of clients you want to attract).
For me, I always have my schedule displayed on a tab. I stated the exact days and times I will be available, and ensure I update it to reflect when I will be available. For me, this allows for clients to book in advance. I currently have bookings all the way into mid December from clients who know they can only see me on X day.
I tend to use the local escort search thingy (1.8 credits per day). I have noticed a significant difference in the amount of enquiries if I don't use this. I also display my number all the time, unless I am on holiday or really can't be arsed being contacted. Again, this widens the amount of clients who will find your profile based on the criteria they search for (ie, they search for girls who display your number). You don't necessarily have to answer your phone, I just put an autoresponse text on to say I will be available on X,y, and z day and if they want to book then to leave me the appropriate details.
When I am available on the day and on the odd occasion I don't have a fully booked day, I will put AT on at midnight and ensure I have that autoresponder on to detail when I will be available. If anything, even though I am not actually available at 1am or whenever they find me, they tend to buy my gallery and movies, so gives me credits.
A few times per month, and especially if touring, I use the profile featuring facility which highlights you at the top of the search results for the area your profile is set in.
Additionally, there are other small things you can do to bring your profile high up in the search results, such as upload photos, movies and blog posts. It used to be the case that if you changed any info on your page, it bumped you up but this is no longer true.
Other tips - ensure you have a catchy headline. You can use certain emjois if you do it from your phone to make your headline pop even more. Ensure your spelling and grammar are flawless, yes, this does affect things. Clients constantly comment on how refreshing my profile is just due to my ability to write in clear and well presented sentences (maybe this is a dying art form?!).
But also, try and get your own personality across. It's your biggest selling point!!