You can consider investing on reputable coins probably not too highily volatile but potential to increase in value and just hold while staying tuned in the spot makert since you can't hold too long and the only spotted risks are your impatient to sell to quick at lost while the market is still promising.
You are saying the same as what I intended to recommend to OP, but I'd like to go more extreme.
A less risky method of making money in cryptocurrency market is Bitcoin. Use your money that you got from whatever legal ways, purchase bitcoin, and hold it for a long time. It's less risky and I sneak peek a fact to newbies too, it's most profitable method in long term too.
My saying is based on past records of Bitcoin
ROI table and
ROI chart in comparisons to other assets. It's true in comparison with altcoins too.