I like and often use the mountain metaphor myself.
Sometimes the path to the top includes some abrupt parts, akin to climbing a vertical wall. These are big efforts that requires long periods of concentration.
These are often followed by easy trails with no elevation, or even downward. This can be boilerplate that you can do without even thinking.
When you've reached the top, if you realize that the path you followed was not the shortest/easiest/most elegant one, know that your new muscle strength will make it orders of magnitudes easier to go down again and find new shortcuts. Clean up, delete unused parts, simplify, comment/document etc.
Finally, you will not even think of it as a mountain but just a small bump :)
Find a local maximum that gives you some space to see around you. Climb a tree, or walk uphill for a good while - maybe a path will be more obvious from up there. In the metaphor, go spend some time learning some hobby for a while, something you enjoy doing but haven't put time into, then re-evaluate.
There is no best mountain to climb, just more mountains.
Sometimes there is no path where you want to go and you are the one who gets to blaze it. This doesn't have to be huge either, the path gets too worn down in places and new turns need to be added to get around those spots.
If you spend too much time looking at your map and compass, you won't end up putting many miles down.
Sometimes the path to the top includes some abrupt parts, akin to climbing a vertical wall. These are big efforts that requires long periods of concentration.
These are often followed by easy trails with no elevation, or even downward. This can be boilerplate that you can do without even thinking.
When you've reached the top, if you realize that the path you followed was not the shortest/easiest/most elegant one, know that your new muscle strength will make it orders of magnitudes easier to go down again and find new shortcuts. Clean up, delete unused parts, simplify, comment/document etc.
Finally, you will not even think of it as a mountain but just a small bump :)