Just before the Oracle sale when it did a reverse split to get back over $10 a share I sold it for less than 5% of its value from 1999.
That taught me a very painful but very solid lesson. You take profits because they are profits, not taking them puts them at risk. When Facebook went public its stock went down. When it got to about 1/2 its opening price I bought some. When the value of that holding doubled (100% return less taxes) I sold it. Had I kept it I would have more now, the profits from that sale helped fund a purchase of some Tesla, which I sold when it doubled in value. Which has helped in other purchases.
Translating that back to your situation, if you're in real estate and you have some solid gains, consider selling, getting the gains and then re-investing in additional real estate to continue to ride the bubble. By taking out profits over time you may not make as much as you could but you also won't lose as much as you could.