Hi Mark.
I’m sorry to read this comment from you, from anyone when the plateau comes along.
What do you work on regularly? And are you remembering to regularly (always) have fun time built in to your guitar time?
Have a look at two of @LievenDV tips here: Tip: "I feel like I'm not making progress" and here: Tip: Plateaus and lack of SMART goals
That could be a start point for further thought, focus, questions and reaching out for more support as and when you need it.
