Could simultaneous land offensives strengthen the Baltic attack?

Would simultaneous offensives on both land fronts strengthen the Baltic operation?

Yes. Pressure in France and Russia would make it harder for Germany to release troops to defend its Baltic coast.

The Baltic landings would require Germany to protect another threatened area. If Allied armies attacked on both existing fronts at the same time, German commanders would have fewer troops available for an immediate coastal response. The lodgements could tie down more German soldiers than the landing removed from the Allied fronts. That additional pressure would depend on coordinating the timing of the operations.