Items downloaded using one account remain tied to that account. If the apps are free, delete them and redownload them with your current account. If you have any subscriptions tied to the apps under the old account, or if you had to pay for the apps, see if you can transfer them to the new account. If you cannot, you will have to pay for them again.
- Purchases can be migrated from a secondary to a primary Apple Account to consolidate them. (This feature isn’t available to users in India.) —> Migrate purchases from one Apple Account to another Apple Account - Apple Support
- Learn about what purchases and associated content can be migrated between two accounts. —> About migrating Apple Account purchases between accounts - Apple Support
If you hadn't deleted the old account you could have looked into using Family Sharing to share the purchases. Too late for that now.