Talk to a few creatives directly, there might be friction in onboarding since they are migrating existing profiles to the unknown. So do it for them at first (Read “Do Things that Don’t Scale” by Paul Graham), it will be more work but might stick longer.

As for immediate returns? Cold emails and DMs.

Define your ICP (Ideal Customer Profile) first and the exact phrases (keywords).

Things like: “Upwork fees”, “I hate Dribble”, “client ghosted”, “shadowbanned”, “portfolio in bio”.
How do they speak vs. how you assume they speak. This might refine where you are posting.

For Reddit, have a natural conversation. Throw in a question first, not a link. Follow up in the inbox:

"Hey [Name], saw your post about the algorithm killing your reach. It’s brutal trying to run a business on a platform built for entertainment. I’m building Talvé - it’s a single link you put in your bio or email that handles your portfolio, contract, and payments in one pipeline. No feed, no algorithm, just a professional way to get booked direct and bypass agency fees.”

The No will tell you something as much as the Yes. 

The repeated links or “advertising” out of nowhere is probably what the bots pick up. Reddit is a full contact sport, if you can grow thick skin there you can make it anywhere.
Stick it out. Goodluck