Your bacckstory is very important as it tells people what house your in, stuff about you, etc. etc. To make an apealing backstory you should stick to one aesthetic/theme. 

Be sure to include:

Hogwarts house

wand

patronous

appearance

Gender

Pronouns

Personality

Blood status

Greatest fear

Greatest streanth

Your inscurities

Mirror in Erside

Animagus

Quidditch team/ position

Ivermony house

Carrer Aspirations

Favorite subjects

Any pets you have (include a photo)

muggle stuff:

Favorite muggle Subject(s)

Career Aspirations

Favorite songs

Favorite books/series

Fandoms your in

Your aesthetic

Backstory stuff:

Early life

Reviving your letter

Wand picking

Sorting

Making Friends

Summoning Patronous

A list of freinds

Other random stuff

News (for if you need to say your taking a break, leaving, or starting an aesthetic/backstory bussiness.) 

Photos througout your backstory that go with the theme, I would suggest that you don't add more than 5, and you should space them out acordingly.