1. Do not jump hierarchies, go directly to your boss even if he is not the one who makes the decision.
2. Reflect on the reasons why you deserve a raise. Quantify them based on merit, experience, or skills. Be specific and preferably give examples. Don't expect the boss to look for the reasons. (You will have enough work by yourself, right?)
3. Do everything possible to simplify the situation so that the boss says yes.
4. Make sure you know the office's policies regarding pay increases (usually reviewed when preparing the budget for the following year) If you ask for one at the least opportune moment, you will run into the barrier of the usual rules of process.
5. Do a rehearsal. Plan the possible arguments that the boss can give you so that you can practice the answers to each one.
6. Learn everything that can help you achieve a superior position. Take advantage of the opportunities offered by your same job. Train yourself, take courses, read. This acquisition of knowledge can help you do your job better. Do not take courses in secret, when you tell your boss, he will see in you someone with a desire to improve.
7. Let your boss know your wishes for improvement. Ask him what needs to be done to get a raise or fill a certain position of higher responsibility (and remuneration). Most likely, he will tell you that learning English, or computer science or taking a master's degree, there you can not only negotiate for financial support with the courses, but when you have successfully completed them, the boss will hardly have any excuses for not promoting you.
8. By assuming more responsibilities, you are going to show your boss that you are capable of performing that position well and that you only need to be given the opportunity
9. Find out how much they pay in the market for the work you do or want to do. That way you know how much your work is worth, in terms of supply and demand in the market.
10. Keep in mind the exact amount you want increased. Say something like, At least 20%? Or at least as much. Do not go out with There what is your will?
11. Negotiates with a smile, as the saying goes: Does the one who gets angry lose?
12. If there is no way to convince the boss, do a very good job for a few months, and insist again later. If your boss truly values your job, he may think that he may lose you if he denies you the raise. Also by insisting it may not give it to you for merits but yes for tiredness.
13. If by repeatedly insisting the answer is still no, and also the only excuse that your boss gives you is the fact that there is no budget in the company. Then it is time to consider changing jobs.
