Always invest for the long term.
Uncertainty is the friend of the buyer of long term values.
Although we deal with probabilities and expectations, the actual results can deviate substantially from such expectations, particularly on a short-term basis.
Market prices for stocks fluctuate at great amplitudes around intrinsic value but, over the long term, intrinsic value is virtually always reflected at some point in market price.
The most important thing in terms of your circle of competence is not how large the area of it is, but how well you've defined the perimeter.