You often find folks on the FPL online forums saying about this Fantasy game of ours: "It's a marathon, not a sprint."
And you can see what they mean: it's supposed to be dismissive of people who gloat unduly over a single week's success (or become too disheartened at a single week's disaster...), reminding them that things can change over a long season, and - most importantly - that you should focus on longer-term goals, longer-term planning than merely optimising for the coming gameweek.
It's just unfortunate that the phrase has become devalued by overuse, reduced to a glib cliché - whose true significance is rarely reflected upon fully.
And the thing is.... it's not a marathon either.
The FPL season is actually more like a series of middle-distance races.
It breaks down into into roughly 5 or 6 blocks of fixtures (of about 6-8 games each; though, depending on circumstances, they might occasionally be a little longer, or - rarely - ever so slightly shorter). And you should really be planning your transfers around these blocks; trying to optimise your team not just for the next gameweek or two, but for the next six or so.
There are some 'macro' features of the season, the same every year (or most years), which affect this division into blocks: the chaos of the two transfer windows at the beginning and the mid-point of the football year; the insane fixture congestion of December/January, and the brutally cold weather throughout the winter months; the interruptions of the international breaks; the loss of players to the African Cup of Nations or the Asian Cup in mid-season every two or four years; the appearance of Blank and Double Gameweeks at the latter end of the season, and the growing distraction of other competitions for those teams who've reached the later rounds in Europe or the domestic Cups.
Then there are some more 'micro' features that may shift from year to year: some teams have more of a 'wobble' of form in the bleak midwinter than others; some struggle more with the demands of European football, due to unfamiliarity and/or a lack of squad depth and/or being particularly unlucky with injuries; the promoted sides usually take some time to adapt to the top league, and don't start to become even moderately competitive until a third, or a half, or two-thirds of the way through the season (but can throw quite a spanner in the works when they do); some clubs may suffer unwelcome upheaval, and/or get the benefit of a 'new manager bounce' from a change of manager; and so on. Most crucially, each season is shaped by patterns in the fixtures; there are usually a few major 'turns' in fixture-difficulty, where a number of teams shift from having mostly very difficult to mostly much easier fixtures at about the same, and these can be a cue for multiple changes to an FPL squad.
It makes no sense to 'plan' for the FPL season as a whole (except insofar as you should recognise its likely 'shape', based on the factors above, and thus be mentally prepared for the likely key moments of difficulty and opportunity spread throughout it). You need to break it up into more manageable chunks, and plan your squad-building around each of those.
Constantly telling yourself that "it's a marathon" may provide some solace when a gameweek goes badly for you; but it can also be a dangerous distraction. You need to be focusing on what you're going to do to prosper over the next month or so.
[I speak as someone who's been a keen runner their whole life, and who's had some experience at all kinds of distances.
I've always been tall for my age, and when I was in Primary School I was considered quite a devastating sprinter (though, of course, this was largely because we only ever ran about 20m or 30m, and most of my peers still had the coordination of newborn foals). In my teens I discovered that I was much better suited to the middle distances: I never quite had the stamina to push hard for a full mile, but was pretty quick over 800m and 1,000m. However, I was never very serious about competition, I was more concerned with the meditative aspect of running; and so I gradually transitioned into running slower and slower, over longer and longer distances. And as I entered my forties, I became interested in taking on the challenge of running marathons - and even a few ultra-marathons. So, I have a perspective on this topic, I feel I have a deeper understanding of the metaphor than most people.]















