I think if i have 10 bitcoin in my wallet, i don't want to invest on altcoins. Just keep holding my bitcoin because bitcoin more stable than other coins.
If you want to buy altcoins, you need to make sure about the coin project, whether it is a good project or no.
You will wasting your money if the coin cannot survive in the future. Better safe than sorry.
For me, if I have ten bitcoin, I will invest in various altcoin because I think the altcoin have a great chance to rise again soon. And I will buy a big amount for each of the coins and I choose with the cheap coin only, and I think I can make a big profit for this. I will use only one bitcoin to invest in the cheap coin and maybe I will get more than five coins because I see the cheap coin have a chance to become profitable coins.