Concentration. Period.

Concentrating. Generally speaking. Concentrate. As simple as that.

Concentrating (1) in the things you want to do; (2) in things you know how to do; (3) in missions you can execute; (4) in deliverables you can deliver; (5) in things that will bring profits in the future; (6) in collecting assets; (7) in saying 'NO' loudly and clearly in cases the above do not apply.

Do NOT waist your time and energy (1) in things you dislike; (2) in things you are not very good at (very good ≠ excellency; it's simply very good. Most successful people were never been excellent in anything); (3) in missions you have a poor to no chance to complete; (4) in undeliverable missions; (5) in cases were you cannot see a clear light (means $) in your life time; (6) in collecting disappointments of your own and the people around you; (7) in saying 'YES' just to please somebody (including your self).

However you can waist some of your money on these. For example money that use for buying of shares, education or hobbies. Anyhow this is not a recommendation but an option.