Nothing. You have no bargaining power since you already work there and depend on your job for your livelihood. If you want more than your 0-2.5% raise then just go find another job.
[1] examples
“Sorry, 5% is the max raise per year.”
“I’m sorry, you should feel good getting 6%, most everyone got less but we really value you.”
“Make the project successful and you’ll be rewarded.” (Hint, somebody will be rewarded for the late nights and weekends, but it won’t be you.)