I do plan on returning. I'm excited by update 3, it does sound like there have been a lot of interesting improvements.
In terms of playing together, I tend to be a loner of sorts, in that when I'm just exploring, doing normal quest content and so on, I tend to prefer to be on my own because otherwise I start to feel obligated to do things in certain ways, feel under a bit of pressure to not stand in the same area killing mudcrabs for 20 minutes, not make that 30 minute detour around the coast because I feel like taking in the sights, and so on. I know that's probably unwarranted pressure, because I know you like to take it slow too! I think in terms of grouping up I feel more comfortable doing so for specific things, like a public dungeon, a private dungeon, a roam through Cyrodiil hunting skyshards, completing quests or jumping into an ongoing siege, etc. I think I'm a single-player style player first, mostly because of my social awkwardness and crushing feelings of guilt, politeness and worries about not annoying people. The bottom line I guess is that I tend to not enjoy myself as much if I'm grouped with someone for no particular reason other than just 'playing the game'. Does that make sense?
That said, there's plenty of group content or content where being in a pair or with a few others is positively advantageous - such as heading into Cyrodiil with specific goals - that I'd definitely appreciate having a friendly face to do that with. And I expect once I got the hang of playing with someone else in those situations I'd feel more confident and comfortable more generally.
But certainly knowing someone was in the game to chat to while I was as well is something I very much like - even if I'm off on my lonesome doing whatever.
I don't know if something like that is workable for you, or if you were looking for someone to actively play with and level with.
I was chatting to someone from the reddit group and he would always message me when we were both online. It was nice to have someone to chat to. At one point I mentioned I was thinking of making a sorcerer, and he said he wanted to make a new character in the same faction, and from that point onwards he kept pestering me, asking if I'd made it yet, so we could level together. I felt a bit penned in, and despite saying that I level really slowly and I like to spend hours and hours just wandering around, backtracking, not caring about getting to the next level, etc., and that not really being his style, he kept on about it. I'm not very good at saying, "No, I don't want to," to people I don't know, particularly in situations like that because I know from past experience what a drain getting abuse that stems from entitlement is - so I try to be diplomatic and ease myself away from it. It was such a pain.
Not that you'd give that abuse! It's a totally different power dynamic at play there, as I'm sure you're aware. It just sprang into my mind because I mentioned levelling together.