I’ll second the suggestion to do the low volume plan, and add a long Z2+3 ride of your choice (when and duration). Doesn’t have to be one only, but at least all should be LIT.
Your CTL has plateaued, so there isn’t much stimulus to achieve super compensation after each recovery block.
Here is someone I’m helping who is on a LV plan during the week, and a 3-4 hour ride on weekends. He tries to complete the 2x HIIT sessions and one long ride as a minimum, or all 4-5 sessions per week of his schedule allows.
