What are some of the best Value investing strategies?

The concept of value is sound. However there is a little truth on market efficiency. The market is often more efficient than an overzealous investor might think.

I dont think it's dead in the sense that it cannot make you money, i think it was dead in the last 10-11 years simply because the general market was doing so well that value fund managers found it difficult to attract investors to throw in the money to their value funds when other funds were literally printing money (momentum funds, growth funds).
I have been doing it for a while, and my suggestion is to read widely, go for a couple of courses, and keep learning!

I am not convinced that the retail investor could successfully do that job, then you loose a lot of time for research, possibly all in vain

Most investors think there is a 'trick' to be able to do better than the average. This idea seems flawed, when many robust studies in finance already demonstrated that even professionals do not beat the market over longterm.

Better stay with a rather boring (but successful) strategy like passive indexing via ETFs.

more on what not to do here:

https://seedly.sg/questions/what-is-your-genera...

Try reading Five rules for successful investing by Pat Dorsey!