I am not a financial analyst and this is not financial adviceIf you want to "invest", the only sane strategy is Dollar Cost Averaging (DCA):
https://www.investopedia.com/terms/d/dollarcostaveraging.aspNo one here really knows what is going to happen to the price, it may go up, it may go down.
All other coins pretty much follow BTC and will do so until they can be uncoupled.
You will drive yourself insane trying to guess, Technical Analysis in crypto is just a guess. You may get lucky, I usually do not.
I think that the price is unlikely to gain any new heights for 12-18 months... maybe not until past 2020 with a new ATH maybe in 2023.
But I want to accumulate more BTC in the meantime, mainly for fun and see where this project goes.
But I don't want to go mad trying to guess the lows and highs..... so DCA of $x per week works for me, disposable income ofcourse.
Also, I set my exit. If BTC reaches $y then I will sell half, when it reaches $z I will sell half again. It may never reach $y, but I don't really care.... it is not the only investment I have.
This way, I just sit back, relax, look at the price once a week. No stress and enjoy all the chat on reddit for fun.
PS.... I am not a financial analyst and this is not financial advice