There are many ways in which you can sell your website

1:First method to sell your website easily is selling your website on website selling websites e.g Flippa etc. There are many buyers on Flippa and someone will buy your website too. 

2:Till sold, you can add a pop up on your website saying that this website is for sale. If anyone wants to buy it, send a mail to [your email address]

3:You can share posts on your social media saying this website is for sale. To buy it, mail [your mail here]