To emphasise long-term participation, you could get new volunteers to write a letter to their future selves, which is to be opened either one to two years later or if they decide to leave the organisation, depending on which is earlier. This projects a sense of longevity in their volunteering journey and could also help to change their minds if they read it before they decide to leave, as it would remind them of why they started in the first place. 

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Similar to the concept of a time capsule, this activity gives volunteers something to look forward to and encourages them to continue their time with your organisation. You may even give a token of gratitude through an appreciation event to award volunteers who volunteered long enough to review their letters.