BTC, ETH, and BNB, some to consider among the top10 coins in the market as for safe and profitable investment.
I'll take only 3-5 different coins but I'm focused more on BTC.
Having the most valuable coin in the market is feel to be more secured especially when we are aiming for a long-term investment. But of course, we don't close the door for some new projects that are worth investing in. Sometimes we neglected to see because we are focused on the top coins.
those 3 coins you mentioned are also my top picks. it feels that you can never go wrong when you have those 3 in your portfolio. and if you still have extra, you can look around for potential projects. those projects mentioned by the OP, i haven't look on those. but will be checking if they are indeed worth your resources.
if notional is backed by coinbase, then they have strong backing. but we don't know yet how they will actually perform in the market. will users really patronise their platform?
whereas, the decredit, no team published but the site is quite informative. however, we need to see first if they can deliver what is stated on their roadmap. til then, we are just speculating their possible future.