You might want to elaborate a bit on the differentiating factor of your marketplace compared to the existing ones as well as why your team is qualified to build it. I don’t think any number of pre sign ups can make up for not knowing anything about the product to an investor. Starting to build a prototype/poc would also go a long way to showing commitment.
"Pre-signups" are leads, and 2,000 leads is essentially nothing. You don't know the conversion rate or the quality of the leads.
Find a way to build the marketplace (which is joining an incredibly crowded category). If you can't build it, you don't have a startup and you should try something else that you can get started without investors.
Just do a less-than-legal presale on BSC or ETH. Build reputation in the crypto trading market, join Telegram and find the trading groups. Don't try to find angel investors.
These pre signups, are those all people that will be creating NFTs? Or does it also include users that signed up because they want to buy NFTs? If both, how many of them are creators and how many are people wanting to buy NFTs?
Also, where and how did you get a hold of these people?
~15 to 18 have interest in creating and minting NFT.
While ~ 80 others have interest in buying and trading NFT.
I was earlier working on a solution that intended to solve creator economy problem in India. I built a telegram group of 1500 digital content creators. In the group people started to discuss and ask if they can have a easy vernacular NFT marketplace.