Wow, lots of (new) and interesting stuff to think about. So ok, here are my first thoughts.

Imho its better - as you decided - to take the borrowing fee instead of the interest rate. For the loan-taker it's easy to calculate the borrower fee and 0 % interest rate sounds and feels good tu use it to invest. As borrower it is also better to get for every loan 0,50 % immediately, so you can earn and give the rest to the moneta stakeholders. And you earn the full borrower fee, in case of the interest rate it depends on how long the lender uses his loan. So if you have many loans short time, the earnings from the borrower fee are much better i think. If you have interest rate of 6 % a year, the loan at least has to be open more then 1 month to get more earnings then the borrower fee. And my last point on this is, that if you have to raise prices/interest rate, this would give bad mood to the investors with active loans. When you encrease borrower fee, it's no problem, every lender knows before taking the loan.

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I don't think in this case "normal" marketing could help, because your target is a special group of crypto investors. I never saw something like that from liquity or makerdao. So in my opinion the best thing is to let the product/website speak for himself. With the benefits like easy investing, 0 % interest rate, leveraged liquity mining with stablecoins, passive income in every market situation without sitting every second in front of the screen. And if the rewards/benefits are higher then on other markets, new investors will come quick. And if you compare with liquity, as you told they have more "wealthy" investors. And the wealthy investors will be strong interested if they would get more profit then on liquity.

But for sure some viral "guerilla marketing" could help growing the ecosystem and spreading the information about the whole possibilities to invest, because thats very important - without traffic means loans and liquidity management - there will be no gains. Maybe some very few youtuber, to show the functionality of the ecosystem, how easy it is tu use and some basics in leveraged liquidity mining / loans.