garage band app disappeared

To explain my situation, I bring some photos. And For convenience, I collocate these in order.

I turned off phone for a month for some reasons.

and when I turn it on, There are cloud shape, which I’ve never seen before, beside some apps include ‘garage band’( I guess It’s about icloud but I can’t precisely figure out the connection between icloud and the problem which I’m now getting through.)

Then, As I touch the apps, it becomes loading phase, and then at some point, it turns into installing phase.

other apps are, then, well downloaded.

the problem is, at some point of installing garageband it suddenly back to the first statement.

I tried again and again, maybe like hundred times, but results were same.

Also, I tried literally every solutions I found on net but they doesn’t work.

(# For sure, I checked my storage is enough to download app. And again, other applications with cloud shape were installed well.)

I’m seriously catious about this error because I had made many songs with garage band. And I guess, for a while, the only way I can listen and edit my own creation is checking the app.

So I really hope to know why this situation happens and how can I solve it as soon as possible.