people who have freetime, what is something productive you can do on your phone?

I have a job where I finish my tasks wayy too quickly which gives me a lot of downtime while I wait for my next task. I usually bring a book to work but I just finished my book 2 days ago and I haven't found a new one, so I've just been sitting on my phone. ts is so boring, scrolling through reels is so mind numbing and pointless but there's not really anything else I can do. What are some productive things that you do on your phone that doesn't feel like a waste of time?

I've found looking at art on pinterest and vsco is interesting, I just wanna see what other people have to say.