Build a few "what if" plans, save them, and see them compared on one chart. Change one thing at a time — a bit more each month, a few more years, a calmer return — and watch what it does. Your plans are kept on this device for next time.
Note: this is a straight-line projection at a steady return (no bumps) — great for comparing plans like-for-like, but real returns are lumpy. For the honest range of outcomes on any single plan, use What's Possible. Not advice.