Biggest issue you’ve already noted (Connection issues)
Outside of that I think for want of a better term I see the ‘New player experience’ the next issue, which covers lots of different subpoints - ie how to retain new players so the playerbase hopefully grows (although noted the growth in previous years is unusual anyway given the playerbase for games is expected to decline over time). I think Penguin did a thread a while ago on this point that got lots of responses.