The way I handle it is by not buying altcoin or bitcoin. Because if I buy it, I will always see the price of the coin that I bought. and that makes me stressful. Every day seeing prices always go down. Unstable. For 2019, I am still monitoring prices. I don't want to take risks.
I think this rule is valid for any crypto that you come to buy, so the secret is to buy and forget or participate, use this crypto, so that the price reason is far away! Also, when it's time, valuation will happen and won't give time for speculation. We are being charged to try to use and participate even more in cryptos, we are missing this interaction and I think this affects prices indirectly. We need to add more value to cryptocurrencies!