You have been in crypto in 2017 which means you are not new to this kind of pull back as it had happened before. The more worried an investor would be if he has invested altcoins because normally altcoins drop way more than 70%. Its not unusual any more for someone who had experienced the long bear market back in 2018.  Those investors after 2018, learned their lesson to dump before the alt markets dive.

Yes it going to be depressing when you saw your money that was once more than 300K, now drop to less than $50K. Feel sorry for myself too when I don't have any idea if I'm going see it goes 300k again, its detrimental. But after 2021, I learned my lesson.

Have you forgotten that we have had many moments? You should be aware of today's Bitcoin price which has finished from a great bullrun but is still holding above the support line.

You are not the only one who has experienced a minus portfolio, but almost everyone including me has also lost 50% of the current total holdings. Since I don't store them in altcoins, then no matter what I already know Bitcoin will come back with a strong push in the future.

If you have altcoins in your portfolio, then not a surprise that your holdings worth has been decreased 70%. Better to hold bitcoin. This time is for the bears but the bull time will come but can still be long before it would come. The market can still be of the bears, many altcoins do not always reach all-time-high, avoid them and hold bitcoin.

You can check 2018, it was full of bears. If 2016/2017 were bullish, also 2020/2021 were also bullish. But in 2018, bear market started and lasted for long, also 2022, bear market has started and may last long. I am waiting for 2024/2025 to be bullish again.

The cyclic movement of the market seems to be the norm at this point and the same rethoric was heard the last time (2018) when the marked went down. But will it recover as it did before (after a year or two) is anybodys guess as there are diferent factors at play such as world recession and what happened to Luna.

As for what @bittraffic said that we guess you have been in the crypto world since July 2017, so actually you also should meet this kind of downtrend like this, much worse  
And this downtrend will still continue again and again until Bitcoin reaches its bottom in the bearish era.
We are here all experiencing this downtrend exactly and our portfolio is in the same drops.

In this situation, if we are holding Bitcoin, we can still hold them for the next bullish era and I believe that the price will exactly pump at the time.
But on the other hands, if they are altcoins moreover hype or new altcoins, well, I ma not sure that it will be back again or not. That is the fact, still not sure

Be patient, dude, only this that I can say

What coins are you holding? If you are holding top coins, no need to be worried so much, you can continue to keep them. Just wait for the next bullrun season, you can sell them at that time, probably in 2024-2025.

Sure, we have experienced the same situation because it is almost the same as in 2018. After bullrun 2017, crypto market drops as well like we experienced this time, but it recovered in 2021, right? So, we shouldn't be worried since it is proven that after bearish should come the bullish season.

In the crypto world, a downtrend as it is today has become commonplace for old crypto users, even this is still incomparable to the past downtrend.
If you enter crypto, you must be prepared with strong psychology, because price fluctuations will be faster, the risk is the responsibility of each.
If we lose up to %70 then hold on and don't sell cheap, you really have to have some spare money. there is a time when the market will return to normal and bullrun, that's for sure.

You should have known the market before you start investing because what we have right now is just a repetition of the past bear market conditions. Whether you invest in bitcoin or in any good altcoins, the moment bear market turns in, its normal to see our portfolio losing that much. However, the market will not be like this for years. Things will come back to normal again when we start receiving positive news that will bring its momentum and boost the market value again.

Yeah, I guess it's too late, 70% down? might take risk here and choose to let my coins sit in my wallet and 'hope' for the next bull run to happen (although it might take 2 years for it).

And just like the rest of us, I'm a 2017 baby here in the community, so I have seen the bull run and then the bear market that followed. And I did survived although it really did test my capacity as a trader or investor in this market. There are times that I wanted to quit and sell off my bitcoin at a loss, but I did try to control and eventually made good profits last year. So the OP might be going to the same emotions that why his health has been affected too (same with me but I just keep a positive thoughts that eventually my investors will recover).

Two possible future for you.
- You can get your capital back 100% if you chose good projects fundamentally. Even if you bought it at all time high, you still can have chance to get it back.
- You will lose more than 70% up to 90% or higher if what you chose are bad projects fundamentally. Because the bear market is just started and has yet found its bottom.

It happens many times. In bear market, altcoins lose more than 95% of their values from all time highs. After the bear market goes away, most of altcoins die.

https://coinmarketcap.com/historical/