The solution is Do not trade. Or learn how to swingtrade.
I think the first mentioned is the better overall option, especially for those who don't know what they are doing, and for that reason don't know how to benefit from up and down movements.
If Bitcoin will dump do not buy alts because alts will dump too.
Not necessarily. If we look at how things have gone lately, people move back and forth based on what Bitcoin does. In other words, if Bitcoin goes up in value, alts tank, and if Bitcoin tanks, alts go up in value. The altcoin market has taken a few major steps back in the recent months due to Bitcoin only increasing in value. At the end of the day, if you buy the market down, you'll get to lower your overall buying price, and that's exactly what people should focus on, but don't actually do so due to their blind panic.