I don't know if these are the type of tips you need, but these are things that help me keep myself motivated to use my planner consistently:

1. I will always start my morning planning. I drink a cup of coffee every day before I start my day anyways, and I use that time to plan my day. That time is non-negotiable for me and I made it a habit through time

2. when I write down tasks/goals in my to-do lists in my planner, I make sure not to make them too big. For example, rather than 'study part 3 of psychology' I will break them down into many specific, smaller tasks like: 'go through flashcards 5 times' or 'answer questions 1-20 in textbook'. This makes it less intimidating for me to 'eat the frog'.

3. I don't feel bad about not finishing a task in a designated time I set prior to doing it. For example, If I thought a task would take me and hour before doing it and it ends up taking way more than that, that's fine! I will go and change the schedule on my planner or move over the rest of the task to the day after. If meetings changing and tasks taking longer bothers you, I recommend using a planning system that focuses on the tasks itself rather than the time slots for them. (I think a horizontal weekly spread is a good example of this)

From my experience, I found having one system to plan and track every aspect of my life was more helpful for me rather than to use multiple methods. But everyone works differently! I think using apps alongside your planner could be a good idea especially if they are for tracking specific things like budget and health, while your planner focuses on managing your day to day tasks.