depending on the coin, maybe the safest long-term is Ethereum, Bitcoin and Ripple and short term you can look for altcoin that is being released and at the time the price is dump
Ripple is the most unsafe coin to invest in... last time went to 0.44$ in May and went down all the way to 0.1$ at some point. lost over X10 value compared to bitcoin until the recovery now which gods now how much it will last before Ripple (the company) sell their holdings ...
14 dollars does not seem as a low fee to me.
Why exactly do you expect the btc tx fee to go down?