If you reverse dollar cost average--that is, if you are a fixed dollar amount at a time--you end up selling fewer shares when the price is high, and more when the price is low. That is not optimal. You do want to set a selling period, at whatever pace you are comfortable with: annually, semi-annually, quarterly monthly. But if you set a fixed number of shares to sell each time, you will then do a better job of getting the average price for your sales.
Of course, this can be tricky to manage over the year. You could sell according to plan, and there could be a big market drop. If you keep to plan, you may not get enough cash to meet your plan. If the market goes up, you may get a lot of cash, but complicate your tax / ACA planning. If you have a cash cushion beyond your emergency fund, you can at least mitigate the first scenario. The second scenario doesn't really need mitigation--just sell less that time, and celebrate that you are ahead of your plan.
I have a barbell portfolio: 100% stoxks, with more than 1 year of cash. I also invest in individual stocks, so I generally sell when the stock performance says so, and end up managing the other way: how much do I reinvest from cash into stocks? But it's a way to think of it.