I don't know how long ago you spoke with TopStep, but from what I have been told recently, they are willing to merge multiple funded accounts into one, provide you with more capital, and increase daily loss limits once you show long-term consistency.
Who told you this, then?
I asked @Topstep this in December 2022.
My understanding is that TopStep will provide you with say a $5K drawdown which effectively is your account size. If you run that account up to $20K, $50K or $100K - that's your money to withdraw at that point. And if you withdraw it, there's no additional funding provided.
Now, if Topstep would recognize a good trader and give him additional funding/capital that would be a fantastic opportunity, but as I understand it that's not an option they're providing.
Now, it could still be a worthwhile option to pursue even if they wouldn't give you additional capital.