Comment spamming worked great on youtube before. Now, if you post too many comments they get easily ghosted.
Since you’ll be using 30 accounts, make sure you use proxy for each of them and don’t post more than 3-4 hours per day. Make sure there’s enough delay between each comment . Also upvoting your comments with other accounts will probably help them get noticed.
Just to be clear, I’m not doing this anymore, I did before and I did it manually. Also, I didn’t use accounts to upvote, I would make 10s of channels and use channel to upvote, it was like you’re upvoting from totally different account, but a lot of things changed since then I think.