What can I do to reduce eye strain when I get a job in IT?

Here is some context:

I already wear glasses (non blue-light)

I found a good 20-20-20 app ( break timer)

I drink water from time to time

I am planning on working in a school where I will be going to classes

I use dark mode all the time (easier on my eyes)

If there is anything more you can suggest for me to do please tell me.