Everything can be accrued with time, and events will return later down the line, eventually as permanent reissues too. There's no real pressure or rush.

The one thing I can see new players missing out on permanently is old Event Equips, since those don't seem to return in permanent reissues.

But IMO this game doesn't have as strong a "forced to play now" feeling like I see in other gacha games. You don't feel like it's a big deal to "fall behind" since it isn't a competitive game in any way. You don't need to be really powerful to clear basic events, so you don't need to keep grinding to become more powerful to keep up with events either. It's a pretty chill game, which I think is its strength for what it offers. So they can take the time to take on all these "overwhelming" quests and mechanics as they discover them, rather than feel the need to read an entire wiki to know how everything works from the get go (although we still have a useful one).

Not to say there isn't more they could do to try and bring in new players. Core gameplay is mostly outside of Nutaku dev's hands and they can only bring in DMM updates as they come (they could speed things up though). Outside of that, I feel like they haven't been trying any new exposure on the internet lately. Back in early Nutaku days, they had even tried their hands on their own serial codes at a convention (for a free Chocolate Cosmos as an example). Nowadays, I can't even seem to notice any "Flower Knight Girl" ads anymore. All I see is stuff for Kamihime or those Western dev games like...Booty Calls or whatever.

And yeah the only community linked officially is the discord one and that has its own issues.

If anything, I think the bigger problem is veteran player retention right now. They're slowly dropping like flies from constant dissatisfaction