I have always owned a diary since I was about 7 until 13 maybe 14 but I kinda stopped. Today I was sneaking in to my younger sister's diary and I thought I start writing again, the thing is I know when I look back on it, I bet it's gonna be boring so i kind of want to spice it up and make it more lively and suggestions?
It's your diary, your rules. It's for you alone and with that in mind, do whatever you want. E.g. your own writing style, write in poems, write in code, make up a fantasy world with silly names but the same events that are happening in your life etc.