I need some investment advice from the veterans here if possible.

Earlier this year I executed my plan and took the plunge by investing in 10 altcoins each with an equal amount of dollars, with some bitcoin left over. As this was my first time I made some mistakes in investing at the wrong time, other coins I did OK. I'm currently a little above what I originally invested in and feel quite comfortable for the time being.

Now that some months have past I feel that I would like to increase my position in all the coins I previously invested in which I believe are for the good long term.

However in the past months I have seen some ICO's with good potential and would of liked to have invested in them but couldn't because I wouldn't be sticking to my original plan with the coins I already invested in, and sure enough recently they had increased a lot in value and I could of made a good return. So my instincts were correct and I should of invested in some additional coins. I know it is said the FOMO is a strong feeling but what happens when it is right??

Are 10 alt coins enough to be investing in?

If I spot a good investment opportunity should I invest in more alts eg. from my original 10 up to 15, my worry is when does it end as the hype never ends.

All the coins I have currently invested in are good solid coins with a good long term future but may have already past their strongest growth phase. If I have a good feeling about an ICO which has good upside potential should I dump one from my current portfolio in favour of a newer coin which could explode?

Hard decisions....