Flat water training
Flat ain;t so bad. As coach Sam would say sure you are at the bottom of the valley but get off your lazy ass and start climbing out. How about some interval training. Rock a 3 x 7min session with 3 minutes rest, Negative split your heart rate and see what you got. The first round will be super rough. Give it a month and watch your horse power climb. Yes climb right out of the depths of that valley you are sitting in.