For heaven's sake, no Gallipoli.
Definitely, although if you leave Churchill in charge, he's very likely to press for another of his dumbass "big ideas" landings, that would fare no better than Gallipoli, such as Denmark-northern Germany or Sicily-mainland Italy. Perhaps it is better to throw Churchill under a bus.
As others have said, the Entente needs America to join in 1915 or so, the US needs about a year to send troops to Europe and if they come after Russia collapses it shall be too late with these odds. Have Wilson somehow get a declaration of war out of *Lusitania.
The CP need to get some of the stupid bug, and waste their own advantages. Keep the Falkenyan-Cadorna wooden heads duo dominant and dead-set on wasting troops in a seemingly endless row of futile bloody offensives on the Western Front that sap morale, while the Eastern Front is neglected and Sweden, Austria, and Turkey are largely left to their own devices. No coordinated CP effort to bleed Russia white, or to encircle and crush Serbia (its downfall is still inevitable, but if an Italian expeditionary corps does not show up in Albania fails to trap the retreating Serbian army, the OTL Balkans scenario shall repeat itself instead of the region becoming a CP playground).
On the opposite side, remove Churchill and his megalomanic landings, purge the Entente armies of butchers like Nivelle and Haig. Let the Entente assume a strict defensive posture in the West, Britain sparing its own manpower to support the overextended and bled-white French until the Americans can come into line. Some peripheral offensives in the Middle Eastern threater like Alex Richards said, but otherwise let the blockade and monting casualties sap CP morale.
Russia may benefit from a moderate defensive posture, but not too passive, and only if the CP stick to the faulty "France first" stategy. No matter how much defensive Russia goes, spaces in the Eastern Front were so vast that trench warfare was never going to be anywhere as effective as on the Western Front. Too passive a defense, and Russia risks to suffer substantial casualties and/or territorial losses anyway, which would cripple morale and accelerate the timetable of the revolution anyway.