I think the coins in the top ten market capitalization are stable coins, you can choose to hold RIPPLE, ETH, DASH, XMR. As long as you have enough patience, holding these will always bring you benefits.
Not necessarily in the top ten of coins stable. There are more stable. Such as Verge, Bosscoin and many others.
Verge is not the slightest bit stable. Verge would be better for an investor looking to higher risk higher reward category. I assume the same applies to bosscoin even though I have no idea what that coin does.