Let's say that "putting in time and effort" is the key to success, aka, "hard work" is the key to success. Alright, now what if you're finding it hard to "put in the time and effort"?
I would say if you find it hard to put in the time and effort, you need to either find ways to make it easier, or find something else which you find easier to put in time and effort into.
I'm not sure if my point will land, but see, for me, the real trick to success is to find something that is easy for you to put in time and effort into. And I think a lot of successes are attributable to that, yes successful people did put in time and effort, but it was easier for them to do so, and that's why they are successful at it.