The question doesn't make sense. What are you trying to ask?

You only need be good enough. Everything else is sheer cope

You have to look at the generality of the results you're expecting, and then base your decision on that.

For example, let's say you're lifting weights, 100 lbs each day. You can expect to see some kind of improvement over a month or two.
So, two months roll by and you don't see any real bulk, perhaps maybe just a little tone. Obviously, you can tell that your approach is inefficient, and that you'll need to increase the weight to 200 lbs to start seeing some bulk.

Your question, however, is a very broad question. Perhaps if you tell us your specific situation, we can give you better advice.

This is the big question that coaches in all walks of life try to answer. Getting the right answer is largely experience driven but the problem is that every individual is unique.

For example every athlete's muscle composition is slightly different and so is his musculoskeletal frame, the strength of his organs and the nature of his mind. That is before you factor in what his goals are and who his competition are. This is where the right coach makes the difference. Through experience and research he avoids the dead ends and gets to good answers quicker.

One thing I am pretty sure of is do not go to "gurus" for the answers. Gurus want to sell you their solution. Its like handing you their glasses and saying "that will fix your eyesight" You can look at what wise men have said and done but in the end it will have to fit your own situation and abilities.

One has to somehow be one's own coach in life and look in from the outside. Really learn about your endeavours and so you can monitor objectively and have ideas about what you might try next. Like in sport, you have to apply a stimulus to get an adaptation and once you have gained that adaptation, you will have to increase, vary or alter the stimulus to get another. The easiest error is to get a good result from the initial stimulus and just think if you keep increasing it, you will keep getting good results. Everything maxes out till you burn out.

All that sounds like a load of the usual bullshit but the fact is that the usual bullshit is all correct, the devil and the salvation are all in noticing the details.