Hi,
Yes, I recommend Adam's talks at the 'Adam Duff LUCIDPIXUL' YouTube channel. In fact, I've started to download the audio and listen to it while out for my long walks.
He's a lovely man and I find his calm inspiration very motivating.
Another thing that I would recommend is to look back through your artwork that you have done, particularly your early pieces, and see how far you have come. Sometimes I will look through my early SVS courses assignment work and I find it both motivating and educational. The time away from it, as I've worked on other areas, has allowed me to mature a bit more as an artist so that when I come back to old pieces I have fresh eyes and a greater understanding and ability. I find that motivating.
Best wishes.
Adam (a different one!)