Not qualified to give you advice but like all of us I can offer you an opinion,
If you enjoy the work, keep Two days a week on and get by, Sell the remainder in bite size batches, which will maximise their value, The van will always have a resale value,
If you don't enjoy the work, sell up right now, consider your self retired and fill the rest of your days doing what you get pleasure & satisfaction from,
If I had survived a stroke, even a minor one, my window cleaning days would be over and the rest of my life would be ahead of me!!