Can't reach PostgresQL database. "too many clients alreadyconnection to server"

I can not connect my postgresql server. By railway admin panel, the error message displays as the screenshot. And, I also can not connect by TablePlus(MacOS DB client app) by same error message. How can I solve this or know more detailed info? I am not senior DB engineer so I may cause easy mistake...

Solution:

New reply sent from Help Station thread:

https://www.answeroverflow.com/m/1193174625648128041

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FATAL: sorry, too many clients already - Railway

I am trying to connect to PostgreSQL and I am getting this error a while after I restart the database.

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