Eliminating use of primary account's @comcast.net address

Hi.  I no longer need/use my primary account's @comcast.net address and I have no secondary addresses setup.  I would like xfinity to no longer use my @comcast.net address for any account, forum, etc purposes.  I want existing email addresses elsewhere to be used instead.  I haven't migrated my @comcast.net address to Yahoo Mail and don't intend to at this point.

I see my @comcast.net address appearing in two places.  One is my profile when logged into my xfinity account and one is my profile here in the forum (both shown below).  I changed my xfinity account personal email to be preferred so as to steer email away from my @comcast.net address.  That seems to be working so far but is that fully sufficient?  I don't see a way to change my forum email address. 

What could/should one do here?  Thanks in advance.