For the past year, I've been struggling with all of these issues and have discovered ways to troubleshoot them to a certain degree, and I hope they can assist whomever may be having the same roadblocks.
First of all, it is very important to always be stretching and flexing your creative brain, figuratively. Meaning, not sticking with one medium, topic, or piece for too long, because you may lose practice in other areas of thinking and execution. It's always a good idea to have multiple projects going to 'keep creative juices flowing'.
For example, over a summer I created 'exercises' and 'assignments' for myself to do, \
such as, 'draw Anxiety' or 'summarize your day' or 'western theme'
One could use mark making, different media, color, content, theme, composition
to emote whatever the artist's interpretation of the assignment is.
One must start out by identifying the goal, purpose, intent of the artwork
and how to best represent that objective.
Or identify an aspect you'd like to change or further and troubleshoot it
with methods and practice.
For example, with my thesis, I work from photos constantly, but I do Not
wish to replicate the images exactly, which is difficult for me.
So, I purposely seek photos to illustrate that I can establish a plan
of execution in style and content that varies from the precise photo.