Yes if you want to invest some on those coins. Both if coins also are at top 20 altcoins, so i think it's good choice to buy and hold some of them especially with cheap price right now.
in my opinion, you better invest altcoin or your money on promising altcoin and so invest does not specify a certain amount, let alone you invest on TRX and Cardano which I think altcoin is not good, but it is up to you I just think you better invest in a promising altcoin
I believe you don't know about TRX and Cardano
It is better to do research first before entering a new form of investment in the world of crypto. If you wan to earn you must think advance in related the outcome you could have in having an investment specifically on new things or new altcoin. Read more details on the project itself or you could also asked some people who have an experince on investing on that specific coins.