I am heavily dependent on GSA SER and have been using GSA SER for decades but for faster and instant results, it depends on your niche/market more than the tool or strategy itself.
As a very safe, high-quality strategy that works in almost all niches:
Build high-quality money site and optimize it well (do your keyword research/on-page SEO/etc.)
Build a few permanent high-quality backlinks from a few domains/subreddits/YouTube channels (you don't need videos there, just a profile with a domain), Facebook page to Blogspot (now Blogspot is hard to index but still worth it). You can basically find self-hosted properties like WordPress.com, Medium, Substack, etc.
Make sure you build at least 10 high-quality properties we call them tier 1.
So now you've got a high-quality, well-optimized money website and 10 properties linking back to your money site.
Then create a few GSA campaigns with decent 50% generic words and max 20 percent brandable anchor text and domain/naked domain/anchor texts including long tail - we call it tier 2.
Then you can again create another campaign inside GSA SER and we call it T3 and point the T2 as target.
Continuously update tier 1 at least twice a month and build tier 2 and tier 3 backlinks daily because some links die and we need to maintain the ratio.
You need at least 3 months to see results. Using an indexer for tier 2 (do follow only) will speed up the process.
I own more than 300 websites and I am running 8 copies of GSA SER along with other tools and the only strategy I do is this. If you don't have patience, you won't be able to win the game. It takes time, tbh. If it's not working and you do it right, the niche is not for you. Even though I own a lot of sites and 20-30% die every few years, I still work on a few handful of niches.