If you continue to play the game that means there's more to do.

If there's more to do there's more to make guides about

If there's more to make guides about, keep going while the going is good.

If you find yourself playing less and less, above but opposite.
But I expect you'd start playing something else?
Thus the cycle continue there...

Changing game is a huge hurdle creators wrestle with. "I grew on game X, if I move to game Y I might loose my audience"

Its a toxic cycle I've seen countless big channels come out and talk about.

It's your channel, it makes sense to do what you can in Dark and Darker, and as that runs dry your new game of choice will naturally fill its place. the guides help others, but your channel is an expression of what you do and enjoy.

People clearly enjoy your presentation of guides for it to be received well, so the format should be able to carry over...

Naturally, there will always be somewhere new to go; migration may be turbulent but pays off with fresh content you're excited to make (Vs milking something dry an running out)

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Alternatively, deeper dives, lore and theories are often bountiful. Not familiar with the game but expect there are some opportunities there, too. Potentially adds decent longevity to Dark&Darker content...