If you're building & running a self-serve consumer app, you really only need to prove 4 things to raise capital and have a good exit:
You can spend $x on acquiring a user and get $y in return. Where y is the Customer Life Time Value (LTV) and is many multiples above x.
The market your addressing is large enough such that your total revenue can become meaningfully large.
You have a clear strategy to reduce the cost of X and Increase the return of Y (This is essential if X is still greater than Y).
You have an IPO in your future and/or (more likely) you have a number of potential acquirers lined up - ideally you've started building relationships with them already.