It doesn't matter if you are published traditionally or you choose to go the indie route and self-publish. It can be lonely and frustrating as an author. Like any human endeavor, author's need encouragement and a source of help and information.
Joining local writing groups can certainly serve as one source of encouragement and information. Joining a larger regional or national group can serve the same purpose and often provides additional sources of aid and information.
One such group is the Association of Independent Authors. You can become an Affiliate Member for FREE or become a full member for a $69 membership fee.
The AIA offers a range of services and sources of support for authors, most of which will cost you some money. Like any other choice you have to make as an indie author that involves money, buyer beware and do your homework.
Still, an Affiliate membership is FREE and you can tool around the AIA's website and learn a few things. This is not an endorsement of the AIA, I'm simply pointing out the organization's existence.