Most of the things you describe is what I am, or what I try. Including concentration, acceptance of things (my way of handling negative emotions), eating healthy, trying to sleep sufficiently, and foremost being passionate about everything I do... the latter is simply my nature, am blessed switch that. The acceptance thingy is a bit more difficult, but getting better at it year after year, with sometimes a relapse, or two 😱 😂 😂 😂 I may be a Stoic already. But need to read the book first 😉