It depends on the type of alt you are buying. If you buy altcoin that is not known and has small community without clear roadmap for development, then such altcoin may be high risk! If you buy alt with proven track record and hold, you may have position yourself for good profit in future!
Fully agree. Look market cap, community.
I built my portfolio like this, but I did not have time to add to my portfolio DOT at discount because it was not on the EXMO Exchange, but already it is there and supplements my portfolio. Took 50% ADA, EXM, ETH and added DOT