A delayed task becomes easier when you stop adding shame to the work itself.

A postponed job collects a second weight. Alongside the actual task there is now a record of having avoided it, and every approach to the job means walking back through that record. So the thing gets heavier the longer it waits, not because it grew but because the feeling attached to it did.

Separate the two next time you sit down. Do the task at its real size, which is almost always smaller than the dread. Skip the accounting of why it took this long, since that part has never once made the work go faster.