Once settled into a job for multiple years what is the best way to ask for a raise if one has not already been given to you?

Both before you start looking for a job and while you're working, keep up to date on the salary range for that job in your area. Websites like salary.com and Glassdoor are great places to start. That way, you know what is normal and what's not.

After you're settled into a job, there's no rule that says you have to wait multiple years! If you have taken on new responsibilities, or learned new skills, that is a good time to ask for a raise. Be prepared with the reasons you think you deserve a raise (good: additional responsibility, bad: your rent went up).

Hello Blake,
The first thing I would is to make sure that you have all your ducks in a row. Generally, you want to make sure you are very valuable to the company. Put yourself in the employer’s shoe. Think about how you have as been beneficial them. Depending on the field, you want to give accurate information as have a concise and direct message as to why they should give you a raise.
Good luck!