Before you ask yourself "what could I do to improve myself" you first need to consider why you should even bother. Two main reasons: First: while suffering may be unavoidable, suffering more than what's necessary is avoidable... so improving your life helps you avoid "avoidable suffering". Second: Your improvement also affects those around you, improving yourself reduces their suffering as well.
Pain, by definition, comes with the desire to be removed; otherwise, it wouldn't be called pain. So, the pains in your life (suffering), whatever they are, come with a (by definition) desire to be reduced]. No one would say "my situation wouldn't be any different if I didn't have this painful situation*." So, you do care no matter how apathetic you may claim to be.
Here is my thoughts on this thing.
Where to start? This question alone overwhelms many who are looking to improve their lives, even if they deeply understand "why" they need to improve. It's overwhelming because there are so many problems in the world*#, both internally and externally.
The key is to start where you can start... Literally: Look around for something that bothers you & see if you can fix it.
Once you harness your ability to identify problems you must learn to identify what you can fix & what you can't. As you improve yourself as a person you will observe real problems that you would like to fix. It will be tempting to stretch yourself beyond your limits.
Many attempt to improve their lives through ill-considered dramatic changes or unreachable goals, setting themself up (often intentionally) for failure. They think that's how improvement happens, not with simple things "The things you do every day, those are the most important things you do."
The act of purposefully instructing your mind to genuinely pursue a goal (take aim) does a strange thing... it literally changes your perception of the world... it reconfigures itself around that aim*. Positive or negative, it follows your aim... So, "Be Careful What You Aim At."