I think you don't waste 2 months of your time. It just takes 2 months to find out it's not the right method. In my case it's 4-5 months.
Fundamental is quite easy; you have to make TikTok think you are a unique, original user and your videos too.
So, make it as unique as you can.
For accounts, use a different device/IP/app/browser profile for each account you create.
For content, change everything you can to make videos look different from the original one, or at least make the TikTok algorithm can't find out. For example: brightness, saturation, timeframe, audio...
My fastest account takes about 10 days to get 10k fl.
PS: I don't sell any course about this. All things you need above. Find your secret sauce.