Our Chrome Extension has 1200 users, how would you value it?

UpDog is me and my friends Chrome extension which offers the smoothest way to check engagement stats for any TikTok or Instagram account.

It's free to use and has managed to reach 1200 weekly active users in less than a year through word of mouth.

The goal would be to grow to about 10k users and then sell it on a marketplace like MicroAcquire and leave it to the buyer to monetize it.

How would you go about valuing a free product like UpDog though? The target number we've kept in our minds is to sell it for about USD 200.000. Do you think that is realistic assuming we have 10k users?

Haven't really found any good frameworks for valuing free services, would appreciate anyones thoughts!