Matic Solana and Polkadot for me, if I have that much money I'd pack these three altcoins and stake them for long term probably two years which will definitely double my holdings, still this money is way too much for just three coins
I totally agree with you MATIC, SOLANA and POLKADOT are best to put your big funds knowing that they really have a profit use-case and they is a high potential for you to gain a good profit. Just to add on the list are the following worth to invest altcoins such as EGLD, ROSE, KCS and CRO.