[JohnFen]

I don't force it.

Most times when I'm doing something new, it's because I'm genuinely interested in the thing and so the problem isn't how to stick with it, but how to keep from obsessing about it.

If the new thing isn't inspiring passion in me, then when I get bored with it I set it aside and come back to it another day[1]. I've completed/learned many things this way, a little at a time, over a period of months or even years.

[1] If it's a work thing that I have no choice about, then I do the needful and just force myself. It's called "work" for a reason.