We can't tell you if it's solvable because we didn't do the research, you did that. So it's up to you to decide if you can do it or not.

Regarding your second point, the general rule for assessing this is: imagine the product is ready as an MVP. Now answer these questions:

- How do you acquire users/customers? Literally, how do you plan to turn someone who never heard of you into a customer.

- How do you make money?

- Do you have enough money to invest to keep it alive until it becomes profitable?

DO NOT: ask your friends, ask your family etc. This is not valuable input to decide if a product is worth building.

A lot of these questions can only be answered by actually shipping a live version and measuring the results of a time/budget limited campaign. So a lot of times you have to build it first and then see if it works.