Hi there, thanks for getting in touch. As outlined on our pricing page, all user tiers on Netlify get support - not just paid plans So no worries about that going away.
Our free tier support offering is this community - but of course, all other user levels are encouraged to look around here as well - we have a vast array of useful information. That said, for some things, privacy is preferable, even for starter tier users, and while keys for private submodules can only be used by you (and no one else) you could open a post in the #admin section of this site, and we’ll get in touch with you in a more private way if it becomes necessary.
A little more information is also available here.