Revisit a decision after reality changed

At [ORIGINAL DATE], I chose [DECISION] because [ORIGINAL REASONS]. New information is [NEW EVIDENCE].

Reconstruct what was reasonably knowable then, what has changed, and what remains uncertain. Compare keep, adjust and reverse options on cost, risk and reversibility. Tell me which original assumptions still hold. Recommend one small next test, not a dramatic verdict. Do not invent market data or judge the past decision using facts that only appeared later.