I'd be curious about what the lack of motivation looks like. In my experience, there are different categories of lack of motivation - true apathy (where I just can't bring myself to care); perfectionist-procrastination (where I care very much but somehow can't bring myself to start) and so forth. I've found the solution differs depending on the reason for the lack of motivation.

I've talked with loads of people about this before, including my T. It comes up in my personal and my professional life (I'm a teacher, and parents reach out about this A LOT. I don't think motivation comes easily to anyone, honestly, and I don't think there's really a magic bullet. It seems like some version of "Just do it anyway" is the main answer.

Good luck with everything.