There are three strategies :

• Fundamental Strategy : A passive strategy, when you only see Bitcoin from factors like total supply, halving process, etc. It's the easiest one when you can simply buy and leave for long time. It can be best way to play safe and for long-term investment, unfortunately you can't accumulate your Bitcoin through this strategy.
• News Strategy : This is semi-active strategy, you need news to act properly. Bad news give negative effect, good news gives positive effect. Just take the best momentum and earn your profit. This is actually good for mid-term investment. If you are a bit busy in real life you can use this strategy.
• Technical Analysis Strategy : This one is an active strategy, you must keep your eye on the charts everyday, every hour, every minute to be able to find an opportunity to earn profit. This strategy is the hardest one but could be the best to accumulate your Bitcoin with your profit.

From those three strategies, currently I use the first one as it is the simplest one and take my time less so that I can use my time more for real life business.