pg_auto_failover setup query

[krishnakongara123]

I've created my setup using below command

pg_autoctl create postgres --pgdata /apps/t360/pgsql_data/autodb --auth trust --ssl-self-signed --username keycloak_dev --dbname keycloakdb--hostname 11.254.118.24 --pgport 1521 --name node_3 --pgctl /apps/t360/pgsql-16/bin/pg_ctl --monitor 'postgres://autoctl_node@11.254.118.25:1521/pg_auto_failover?sslmode=require'

My monito node is : 11.254.118.25
My Primary is : 11.254.118.24
Standby 1 : 11.254.118.18
Standby 2 : 11.254.118.19

Once my HA setup is up and running,

Do i need to maintain this user forever keycloak_dev ? and keycloakdb?

the reason for asking this question is that, i had this issue... Due to some requirement changes,
i had to re-create the user and database with different name,
but the moment i tried changing the parameter max_connections....
it stopped working, neither it's not coming up nor failover is happening ?
the reason from pg_autoctl status telling that keycloak_dev user is missing... asking me add it back...

in that situation,
i'm unable to add that user back, as my both secondary instances are in read-only state and primary is not coming...

how to handle such situations?