I'd advise you learn positional play and endgames. Learn them and you will reap great rewards, I know I have!
Time Management in Training
To get better, you should get a coach to help figure out what best course of action is given your strengths and weaknesses.
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Older player, getting more serious. Let's say I have 4 hours a day I can give to chess improvement. How would you advise I spend my time?
Thanks.