Individually Facebook message people (family and friends) who have either donated in the past or you know like to donate to charities. 

Collect all your loose change, throughout the house or in your car and donate it.

Set incentives on Facebook like if you raise $250 within 24 hours you will post a video of yourself doing something embarrassing or something.

Customizing Facebook posts instead of just posting the generic one.

Venmo request all your friends a few dollars and see who actually does it.

Collect addresses by asking parents for their address book and send out personalized letters

Do your friends' laundry for donations 

Organize an event for your team

If you have a job, ask that company if they will match how much you fundraised within a certain period of time

Sell items you no longer want anymore and donate it to your drive 

Deposit extra cans and bottles at the bottle return, which can be found at your local supermarket

Share your "why". Tell people why the cause means so much to you and they are more likely to donate