I want to invest in few alt-coins and I do not know which projects are good and which are not.
I have chosen this 8 options and I need to remove 2 so I only stay with 6 of them.
List:
XRP, XLM, SOL, DOT, SHIB, ADA, MATIC, ZRX
Which 2 should I remove?
All the tokens you've listed above are good projects with a highly potential future, I understand why you're finding it difficult to choose which to remove.
Although, in as much as they all have potentials, there are factors to consider in other for you to know which tokens to remove and which to keep.
Everyone has investment goals even before they start their investments, you can't just wake up one morning and start investing without an investment goal, so I'll advice you go through the tokens' road map and find the ones that align more with your investment goals and then you can remove the ones that are in less/not in alignment with your investment goals.
Again, you need to consider the coins' market capitalization as well as the liquidity.
Like I said earlier, look at the road map of each coin and know which one has a better future, I believe if you put all these into consideration, you'll make the best choice on which token to leave or remove.