As @Asgard and @tyme have mentioned a big part of motivational interviewing (and really with any therapy) being successful relies on our own willingness and readiness to engage with it.
@Rel76 If you are curious about making some positive changes and being more proactive in your mental health, but have struggled to actually get started, then motivational interviewing could be really helpful as it can help explore your own motivations for change and bring to light some of the things that have been getting in your way.
Like others have mentioned though, it can take a skilled therapist to know when to introduce motivational interviewing, and do it well so that it feels conversational and collaborative, rather than an interrogation. My therapist has used motivational interviewing, in combination with other methods like CBT and ACT, and I've found it to be really helpful and an insightful part of therapy.