1. Only sell bitcoin when totally necessary.
2. Continue to not spend money on unnecessary stuff.
3. Continue to focus on creating more cash flow to have more money to invest in assets.
4. Continue dollar-cost averaging weekly regardless of BTC price.
5. Price crash? Continue holding as per usual.
6. Only trade shitcoins with less than 5% of my total holdings.
Unless you're really experienced in the field of trading, chances are, doing the "sell now and buy back lower" strategy is just going to wreck you in the end.
Those strategies you mentioned above actually are more than enough not to get screwed in this market. Right now, exit strategy is hard to execute as bitcoin is going up and reaching new ATH almost everyday. As we are more than 58k as we speak, people or institutions are still buying. But remember, correction is just around and you need to be ready if you have short term plans for your bitcoin. I understand that some people here need to cash out because of their financial needs. So if you are looking short term here, and you are already in good profit, you can cash out if you are comfortable with it.