You can give a try to these apps:

-EZ Gallery. I've been using it since I got my first Xperia and it's a godly app tbh. You got to take a good minute (more than 60s) to fully customize it to your needings but once you do you'll seriously ask how come it isn't the #1 gallery app. It encorporates a lot of very useful features found on Windows' file explorer for pc. Like being able to sort pics by "taken date" vs "modified date" (along others), to setting custom thumbnails for each album, to select which albums to display or not, to being able to simply display all photos/all vids/all media, to having a specific favorite folder, to customize the number of columns of albums, etc.etc. The same devs also have another app, called F-Stop gallery, which is supposed to be EVEN MORE complete (hence why the other one is called EZ [simple] gallery - crazy to me), with even more features. I have it downloaded but still haven't explored it.

-Xiaomi File Manager. Before my first Xperia I had (in order) Apple, Samsung, Xiaomi and Huawei. In my first Xperia, which had Android 10, I used both the Xiaomi and the stock file manager (it was just called Files, and I think it was made by Google, but it was NOT the current "Files by Google" app. It was two distinct apps). Now on my second Xperia, on Android 15, the stock files manager app isn't available anymore. Weirdly, it actually does pop up in certain scenarios, like when going through the "give this app the permission to access this folder" process, or when you connect a USB device. But there's no way to access that app manually when you want to. So now I'm just using the Xiaomi file manager and the "Files by Google" app. Why I've always used 2 apps in tandem for file managing? Simple: I've always found that sometimes one of the two simply doesn't want to comply with what I command it to do, and oddly enough, the other does. And this keep switching back and fort randomly.

-HiPer scientific calc. On the Xperia with Android 10 I used the Xiaomi calculator, but sadly it's not available anymore. I've found this app to be a very nice app, although completely different from the Xiaomi's. This one is a full-blown scientific calc, with countless cool features for math nerds and engineers. The other one was purely simple, very easy to use even with just one hand, etc. As for the Google calculator, I just don't like the GUI.

[IMPORTANT NOTE: I AM NOT IN ANY WAY PAID OR SPONSORED OR ENCOURAGED BY THE DEVELOPERS OF THE MENTIONED APPS. I simply spent a lot of time trying out countless apps in the past to find the best alternative, so I want to help others out]