sharepoint online – Which account we should use to manage MS Flow connections

I always uses our offcie 365 to create MS Flows which trigger when addiing/updating sharepoint list items, for example I have created an MS Flow which uses connection to :-

1. Send emails to users using exchange connector.

2. Send Approval emails

3. Connect to SharePoint list

as follow:-

now i created the MS flow using the office 365 admin user, but this user might face these issues in the future:-

1. Its password will get expired.

2. The username might be changed/removed

so what will happen to the connections inside the MS flow if any of the above 2 points happen to the user? will the connection stop working? and if the answer is Yes, then how i can overcome this problem that might occur by time?

For example, atleast for the password, we have the password expires each 3 months, and there might be a time where the password is expired without been directly renewed, so will the connection stop working from the time the password is expired till it is renewed?