I understand what you're saying, but it's not that I'm ignoring the potential of Reddit, the thing is that when the time comes, I'll have a lot of time (at least in the beginning) to spend on getting traffic on those social media platforms.
I mean, I could post on 20-30 subreddits daily, and it would only take me 1 hour at max. And the same with IG and TikTok. I think it won't take me too much time to analyze the competitors, create the content, and post it.
I have aged accounts, 3-4 years or so. And some of them have a little bit of karma.