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Do a little every day. It adds up.
I find less is more. Select a reasonable number of figures to paint, and have those out. Clear all the rest away, out of sight. Then you can focus on those figures and progress them, without be distracted by all the other stuff calling out to you. Once these are finished - or you are really really bored of them, swap them out for another reasonable number of figures. What constitutes a reasonable number of figures is very much up to you - but I would err on the lower side to start with, better to get something finished than have a bunch of half-done stuff.