The broad and vague answer to the broad and vague question is - deliberate practice. Deciding what to improve, choosing the lessons and exercises to help you get there and assessing how well it's going periodically.
As the other posters noted, there is a wealth of information online but you first have too answer the question "what do I mean by getting better".
Good luck and have some fun on the way. I can empathise with the lack of time that little kiddos leaves you with so make sure you're enjoying it too.
One last thing that really helped me - it's also OK to enjoy playing at the level you're at if that is what life allows. We don't always have to be chasing after improvement.
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Martin
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