To help users reduce distractions, many digital self-control tools (DSCTs) use strong enforcement mechanisms (e.g., locking the user out of undesired apps during work hours). However, these tools often trigger psychological reactance - the desire to restore the restricted autonomy by circumventing or contradicting the tool. We propose ways that designers can leverage self-determination theory, an evidence-based theory of human motivation and wellbeing, to support users in internalizing the motivation behind their goals and reduce reactance.