Bitcoin has collapsed like three times in the last like 7 years dawg.
If you bought 1 BTC 15 years ago, you still have 1 BTC. It has not collapsed. The price relative to USD has collapsed a few times, but the average trend is growth. Bitcoin does not guarantee any price relative to any other currency, because it can’t, all it can guarantee is a stable supply of currency. The USD, in that time period, has lost >20% of its purchasing power as well, so the USD also “crashed”.