Slow progress does not equal failure. It is progress, however slow it may be because you are moving toward your goals and desires. Let go of the belief that you are too old or not talented enough. I could list a host of people who were too old and not talented enough and yet still succeeded.
This is where many people fail, if we deem failure to be “giving up.”
This is part of the discipline, the belief in yourself and the deeper desire to accomplish your goal.
We absolutely need the tools and techniques you’re describing when you feel like you’re failing or not making progress.
And a large dose of stubborn determination helps! :-)