The hidden cost of choosing something is often everything the choice prevents.

The visible price of a choice is the effort it takes. The hidden price is everything you can no longer do because you chose it, and that price is usually larger and almost never calculated. It does not appear on any list, which is why people can accumulate reasonable commitments and end up unable to do anything that matters to them.

Look at your current largest commitment and write down what it has prevented. Not to regret it, but to see the full price. Then decide again with the real number in front of you.