Welcome to Tapas and the forums!
I join other people's sub4sub threads on the forum nearly every day, and have done so since September 2024. I rarely post my own threads, though.
Yes to both. My views increased a bit at first, then diminished, but as I've continued, they've grown steadily since I started posting to these forums frequently. The other creators here are generally good viewers, likers, and commenters. Likewise, I keep up with nearly all the comics I'm sub4subbed to, unless they're very poor quality. I can't keep up with the webnovelists though, there aren't enough hours in the day for that. Many of the comics I actively look forward to are ones I found through sub4sub!
Don't expect the other creators to join your Subscribestar/Patreon or send you money though.
Hosting sub4sub, like4like, and comment4comment threads works well - but only once every 4-6 months. Otherwise, the regulars will stop responding, as there's only a dozen or so of us here at a time, and you can only sub once!
Review-for-review threads are great for feedback, if you're prepared for criticism. The best though are if you exchange something only you can do, like gift art of other people's OCs, in exchange for what you'd like to receive. That's a lot more work on your end, though.
Basically, put out into the world the kind of energy you'd like to receive.