recently I opened a online shop selling children's toys. at first I tried to make and design your own website but apparently my knowledge is not enough. I used the services of professionals and for a certain amount of money they made me an amazing site in the shortest possible time. a few days my site lasted at the top of the search engine list and now I noticed that he slowly falls lower and lower. please tell me what to do to the site was always on the top line of the list. and how much it will cost if you need the help of professionals.