What should I do with my refund?

I’m 24 and expecting a tax refund of over $2000. What should I do with it? I’m currently on track to max out my Roth IRA before I become eligible for my employer 401k match (I’m throwing all of my retirement savings into my IRA until then). I have no debt, I have roughly 8 months of expenses in savings, I am not looking to buy a house or new car anytime in the next 5 years. I try to live very frugally and try to put roughly 35-40% of my income towards savings and retirement. I do eventually want to go to grad school which will cost me anywhere from $10-35k depending on where I go and if/ how much my employer pays for it. I also am still on my parents insurance until 26, so I am doing the best I can to prevent lifestyle creep knowing that my health insurance cost will go up significantly in the next couple years.

What makes sense for setting myself up for the future? Put it towards retirement? Invest? Save? I just want to set future me up the best I possibly can.

Edit: not sure if this is relevant but I am taking a 15% pay cut pretty soon. Same job. I currently work nights and I got the opportunity to start working days and ran with it. It usually takes years for day shifts to open up and I thought it was worth the quality of life increase. I obviously do well with saving and contributing towards retirement, but I also have a fuck ton of privilege that I’m super grateful for (no student debt, my parents gave me their old car, I’m still on their health insurance). I feel like even one of those additional expenses would make it so I’m living paycheck to paycheck. So trying to get used to living as tight as possible while still doing the things I love before some of those expenses inevitably become part of my reality. I’m a very financially anxious person, and would rather set future me up for success. I’m just at a point where idk what the best thing to do with a decent lump sum of cash is.