Do not panic: It's important not again panic and sell your Bitcoin immediately. Bear runs can be unpredictable, and the price may rise again.
If you are a newbie, you can't prevent yourself from getting panic especially if you're into investing for the first time. If you don't have any experience at all with regards to investing, you can't avoid yourself from panicking, and with how volatile Bitcoin is, there are some new investors out there who are making some bad decisions because of them getting panic.
Over time, you will learn how not to panic. Just have experience. You will learn from your experiences.
Do proper research: Before making any decisions, please do your research to know why the price is falling. Look at demand trends, news, and other factors affecting the price fall.
I can't count how many times users here said this, but the unfortunate thing is that no one wants to take time to research. I remember just a few days ago, one of my neighbor scammed I think around 800$ because he invested into a gambling site which turned out to be a scam.
Have a clear investment plan: Before investing, it is important to have an obvious investment plan that aligns with your financial goals and risk tolerance. Stick to your plan to avoid making sudden changes in response to short-term market changes.
When I started investing, I don't have any clear plan at all, but I know that I wanted to invest for my future.
Now after a few years of investing, my clear plan is to invest early so I can retire at a younger age. Younger than the regular employee's retirement age. Different people have different plan when it comes to investing. Follow what the OP said that whatever happens, stick to your plan.
Always remember, the crypto market can be volatile and unpredictable. Make sure to invest wisely and always do your research before making any decisions.
I guess you need to change "can be" to "is" because crypto market is volatile, and it will not change (at least in a few years or decades I guess).
Overall, making research, and being discipline enough to know what to do in certain situations will help you in investing.