For peace of mind buy and hodl for a long term atleast for two bull circles you will be sure that whatever price will be then you will be in profit. DCA method is recommendable for income earners, buy with a percentage of your income and hold for the long term.
For two bull cycle that's 8 years but to just be in the safer side lets lets do 10 years that's a decade before thinking about cashing out some profits. If you just follow the two bull market rule, you might end up selling in a bear market and although you'll still be making a profits but you would have missed out of potential gains that you would have gotten. Of course no body rejects more money so after you dun invest, try make the period why you want sell make e for be during bull market. Trading Bitcoin isn't even advisable because why you go dey stress yourself dey chase small small profits when you go fit just hodl Bitcoin and make easy profits.