If you don’t have a coherent theory to {act}ively hold an asset, you probably shouldn’t be acting to hold it, and be acting to sell it.
This is equally true for TSLA and NVDA as it is for VOO and BRK.
Why? Because when prices are too low you need to be able to hold (and ideally buy) with conviction and when prices are too high you need to be able to sell with conviction, although the latter is less important if you have steady income.
If you don’t have a theory of value, you’ll be able to do neither effectively, and risk loss of principal and opportunity in a downturn.
