Updated Apps are not getting downloaded on iPhone 6 ios 12.5.4 what will I do?

An iPhone 6 cannot use apps that require iOS 13 or above. From your screenshot, it looks like you can get the older app version for use with that phone. If you want apps that can use the current iOS version for most phones, you will need to get a newer phone.

Because it’s not going to happen. That iPhone model is 7 years old and cannot be updated past iOS 12.

If you need to use apps or features that require iOS 13 or later, you must purchase a newer iPhone.