This is in the class of problems where you need to know what will happen in the future in order to make the best possible choice.
Since we don't know what the future will be, we simply cannot choose the best possible choice.
However, we can turn the question around 180 degrees and ask, "How can we avoid the worst possible choice?"
That's possible to do without knowing what the future will hold (assuming one can make a reasonable guess about it).
Make a list of options to choose from. But instead of focusing on the best possible result, focus on the worst possible result.
Then, quite simply, don't do anything that will result in that choice.
If there are multiple results you don't want to live with, don't do anything that will result in those results either.
In a simple example, my choices are between:
1) Carry an umbrella with me when I take a walk. The worst will be I have an awkward item to carry or I lose or break it.
2) Take a walk without an umbrella. I will get wet if it rains, and possibly sick from that.
So, which result is the worst? Pick the other option. :)