It feels really bad going through my portfolio on blockfolio to see massive downward movement in the value of my holdings. I really don't know if this is the usual market correction we have periodically or the end of the bull run. Is it wise to keep holding or take what's left?
Market corrections doesn't have specific range to call it as "usual". Corrections are inevitable and that's a nature of a highly volatile market. Whether it's a short correction or sharp correction that's still called a correction, a sudden declination of price after the bullrun.
Now the question is, is it wiser to take what's left even If it means you're not profiting just to avoid further loss?
Of course not. As long as you're not holding the shitiest coin, I guess you're fine to hold it and wait till it pumps back again.
Market cycle goes up and down. Not all the time the price is on top.
Also, if he doesn't have urgent needs for his cash, better hold it. As you said, as long as the coins are not considered to be the crap ones, there's a chance that it will go up again. But if it is a crap coin, high likely that it will be totally abandoned by the 'dev' team. So if you are holding like eth, bnb, just for example, I guess there's no need to worry. This correction is needed for a healthy market. And it doesn't mean the downward movement is forever, so sooner or later, we will see the upward movement again.