New iPhone didn't bring over half my apps

Are the missing ones actually gone, or are they sitting there as greyed out icons with a little cloud? After a transfer the phone brings the layout over first and then downloads the apps in the background, and that can take hours if it's on a slow connection or not plugged in. Leave it on wifi and charge overnight. If they're truly not there, open the App Store, tap your profile picture, then Purchased, and you can reinstall them from that list. Anything that's been pulled from the store or isn't available in your country won't show up there, and that's usually the handful that never come back.