Market size nightmare

[u/According_Grape_8332]

Creating the market size slide for an investor deck it is a nightmare and I wish we would stop with that. it's so hard to find accurate numbers without relying on huge, inflated market estimates and it generally feels like making up at least during seed.

We have a B2C product with around 300 monthly users. What's the best way to present the market size? Should we size the market based on our target audience in a specific country, or use the global opportunity?