Switching to a 4-Day Workweek to Save on Commuting Costs—Worth the Pay Cut?

I've been thinking about asking my employer if I can move to a 4-day workweek to save on my daily $10 commute and reduce spending on lunches out. Currently, I work 5 days a week, commuting about 20 miles each way, and my monthly transport and food costs add up to roughly $400. The catch is that I’d have to accept a 10% pay cut, which worries me since I’m already trying to build my emergency fund and pay off a small credit card balance. I’ve tried cutting back on lunches and carpooling some days, but the savings haven’t been huge. The idea of having an extra day off sounds amazing for mental health and side projects, but I’m unsure if the income drop would set me back financially. Has anyone made a similar switch? How did it affect your budget and overall financial goals? Is the reduction in commuting and daily expenses enough to offset a pay cut?