(This may not apply to you, but something I’ve noticed and you should maybe consider) I feel like often what you might consider introspectiveness is actually just self criticism. True/good introspectiveness should also include being aware of the good parts of yourself and your good habits, which can allow you to stay in a good mental space because you use self affirmation through other positive aspects of yourself when you notice something that you’re doing wrong.
Also, there’s no one-size-fits-all solution, it’s a lot of trial and error and maybe going into therapy with a more focused goal could be helpful. For example, tell your therapist that you want to try different things to see what works for x problem- come up with a list of what might work together- every week commit to trying one or two of those things and report back to them on how it went, and again make sure to pay attention to both the fails AND the successes