Isaac Mostovicz (@IsaacMosto) header
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Most startups miss something essential—not funding, not talent, but a deeper truth. What’s the part they forgot to build?

Jerusalem, Israel
Joined November 2008
Photo by Isaac Mostovicz (@IsaacMosto)Photo by Isaac Mostovicz (@IsaacMosto)Photo by Isaac Mostovicz (@IsaacMosto)Photo by Isaac Mostovicz (@IsaacMosto)Photo by Isaac Mostovicz (@IsaacMosto)Photo by Isaac Mostovicz (@IsaacMosto)Photo by Isaac Mostovicz (@IsaacMosto)Photo by Isaac Mostovicz (@IsaacMosto)Photo by Isaac Mostovicz (@IsaacMosto)Photo by Isaac Mostovicz (@IsaacMosto)
LOOKING FOR CHANGE Marketers fail to explain their marketing plans the C-Suite in many cases. Recently, I have seen a series of questions top management asks the CMO or equivalent, which were utterly wrong. I don’t blame these executives. They struggled…lnkd.in/dEWJQ_9
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What’s the #1 reason startups fail in your experience?
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Sin #3 — Ignoring the customer’s voice. Funnels don’t buy. Humans do. Learn how to hear them: isaacmostovicz.com/home#down…
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A startup I met raised $2M before talking to a single paying customer. They built fast, hired fast… and burned out fast. Lesson? Speed without direction is just a quicker way to crash. The cure: isaacmostovicz.com/home#down…
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Sin #4 — Chasing hype over substance. Hype can get you funded. Only substance keeps you alive. Full breakdown: isaacmostovicz.com/home#down…
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Why ignoring the customer’s voice kills even the best-funded startups 🧵
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If you can’t hear them, you can’t serve them. And if you can’t serve them, your product dies — no matter how good it is.
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I teach founders & investors how to hear the *real* customer before it’s too late. Guide here 👉 isaacmostovicz.com/home#down…
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Founders — What’s the biggest assumption you made about your market that turned out wrong?
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Sin #2 — Building on assumptions. Customers don’t buy ideas. They buy solutions to their *real* problems. Avoid the trap: isaacmostovicz.com/home#down…
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Sin #1 of the startup industry — Funding too early. The most expensive mistake you’ll ever make. How to avoid it 👉 isaacmostovicz.com/home#down… If you only fix one thing this year… fix this.
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Investors — When was the last time you met a *real* customer before funding?
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Sin #1 of the startup industry — Funding too early. The most expensive mistake you’ll ever make. How to avoid it 👉 isaacmostovicz.com/home#down…
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Sin #1 of the startup industry — Funding too early.
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Founders — What’s the biggest assumption you made about your market that turned out wrong?
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Ignoring the customer’s voice kills even the best-funded startups. If you can’t hear them, you can’t serve them. And if you can’t serve them, your product dies — no matter how good it is.
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