As long as you don't sell it, you have nothing to lose, maybe only the value in the portfolio is reduce, but it also picks the top coins and is likely to rise again after a while of decline so don't regret it and believe in the full investment.
Regarding shitcoin, this is indeed a risk that must be faced, because in every decline there will certainly be anxiety once the decline can become severe and difficult to return, so I always give a percentage of at least 20% because I don't dare to invest too much in shitcoin for me this is too vulnerable .
If you are new to crypto market, then you are not used to it seeing bitcoin having price fluctuations. People will panic eventually when they see the value is decreasing. Of course its a normal scenario, even other coins fall into their dips. But it won't be a loss in your part if you are still holding it for long term, unless you start panic selling then it will definitely make you a loser.
However, when it comes to investing, i always prioritize bitcoin over the others. It's like 50% for bitcoin, 20% for altcoins, and maybe 10% for shitcoins. Shitcoins won't give high chances anyway to make profits so if ever i lose, i always see to it that it won't create a big impact on my funds.