Font Issue

In Addition to everything else that's been said, if these are old Type 1 postscript fonts they will no longer work in new versions of Adobe software. OS support for T1 fonts is also ending.

Which composer did you choose? Adobe Paragraph or World Composer (found in the Paragraph Style Finetuning)

Can you please let us know more information about your situation?

18.2.1 of the ME version ?
What Hindi font is not working?

Are you using font management -have you cleared your font caches?

Have you tried troubleshooting indesign?
Try resetting your preferences:

Windows: Start InDesign, and then press Shift+Ctrl+Alt. Click Yes when asked if you want to delete preference files.
macOS: While pressing Shift+Option+Command+Control, start InDesign. Click Yes when asked if you want to delete preference files.
A dialog will appear asking to delete the InDesign Preferences, select 'Yes' on this dialog.
Further info and instructions here if needed:
https://helpx.adobe.com/in/indesign/kb/indesign-preferences-support-file-locations.html

---

Reinstalling rarely fixes everything - you can do a complete reinstall using the
Creative Cloud Cleaner Tool https://helpx.adobe.com/creative-cloud/kb/cc-cleaner-tool-installation-problems.html

---

Rollback to a previous InDeisgn version

https://helpx.adobe.com/download-install/using/install-previous-version.html#:~:text=Open%20the%20Creative%20Cloud%20desktop,down%20list%2C%20select%20Other%20Versions.