First, make a list of the top ways in which you bring value to the company and your most significant accomplishments.
Think of concrete examples showcasing your talent and how the company has benefitted from your employment.
Also, list any certifications, training, or degrees you've obtained since getting hired or your last performance review.
Finally, highlight any specialized skills you have. If your expertise is a rarity in the field, that's worth noting too.
Look at what job duties were listed for your role when you first started working. Has your company added more responsibilities but not increased your pay? Don't forget to mention if your responsibilities have increased.
A pivotal element to landing a pay raise is knowing the pay scale of your current job. You must know your worth to prevent getting underpaid. Imagine how awkward it would be if the top of the salary range for your job is a $30 hourly wage, and you ask for a $50 hourly wage.