Is there any way for newbies to build reputation besides spending months to become a regular?
You can very quickly get a bad reputation, but I take it that's not what you're looking for. A good reputation doesn't take months, it takes a lifetime.
Maybe some kind of a guarantee given by an already reputable user?
If you know someone in real life, and they trust you, they might vouch for you.
I've met a prominent user of this forum with whom we discussed my non-crypto, non-tech related project. I could probably show some of our PGP-signed messages to ensure everyone that I can be trusted, but they def won't be happy with it.
Breaking someone's trust by publishing their private,
encrypted messages will quickly get you a bad reputation.
I have found only one investor so far and yet they don't have enough time for everything.
So that's the real reason you want "a reputation"? To get investors?
So you're telling me that trust built in long-lasting relationships matters less than the trust earned by trading with other users? That's great! I guess I'll go farm the so-called "trust" by doing small transactions with other users
Even better if you use (and pay) an escrow on the
Collectibles board. If you're lucky, both users leave you positive feedback... It's a quick way into being "highly trusted".
Why would a reputable member "guarantee" for a newbie?
If, for example, my wife would join here, I could vouch for trusting her (but most definitely not her computer!).