Answer:
Get engage in your favorite activities and hobbies
Get over from your comfort zone.
Don't keep any thing or any evidence or materials and memories of that person who you want to forget.
Watch party songs
.
Dancing is the best option
Make new friends instead of getting cry over old one..
Go to clubs..
Take a break from your daily works..
and go to beaches and near the natures..
Talk with your self in front of mirrors
spend time with your grandparents bcoz they can give you some tips on this.. they are more experienced than u.
Always smile..
Delete all the chats and number of that person