I'll tell you what to watch out for: people selling backlink packages here. It makes no sense in 2025. not to mention the quality, which is poor. If you want to invest in something for SEO, buy guest posts from time to time from large domains with good traffic. Write the articles yourself, because 90% of the sellers here can't even put a link in the text correctly

. They paste some crap from AI that they don't even read, and move on

.
Personally, I've adopted a strategy where I have a domain that isn't important to me. I test the service on it first, and only then on other domains

. Otherwise, I would have been in Google's blacklist for spam and crap links a long time ago.
What's funny is that these people write great stories about how they're SEO specialists, how great their links are, how much traffic they get, and yet their knowledge is zero. They want to scam you and write good reviews about themselves.
So, brother, you have to think carefully about what you do, what you buy, what you spend your money on, because one wrong move and you'll go down, not up.