No matter what strategies you use. its already very fast earning compare to other investment...i would recommend hodling good coins for 1 to 2 years. the earnings will be larger than flipping. Flipping sometimes can get your burnt if it went below ICOs and end up chasing to recovering loss.
I agree on what you saying... If a project, team and idea is good you should try to hold it for longer time! Just be allays up to date about the project... as said earlier, 2- 3 long term hold coins and few gamble coins is proper for starters!
Yeah so should OP need to find coins that are really promising to hold and in fact it's quite hard to look for. Maybe he can try to invest in a well established coin like btc and eth and HODL it and there will be a chance of good profit.
Ethereum, Bitcoin, Monero, Dash, Zcash, Litecoin and Ripple always are best choice for long term investment. These cryptocurrencies have proved they are strong in the market, every crypto own a large community and other altcoins can not compete to these cryptocurrencies.
I wouldn't say they cannot compete or will day compete... but the ones you mentioned are lets say stable ones and might be good to make first experience with! Beside some other coins of course...