You can say I am one of those Micro investors. The investment into many blockchains can be done on smaller amount like 1 USD etc. However blockchains like ETH type cost a lot. And you can't really do small investment and instead you have to put on a bit of mid range values to bypass the transaction fees. However I think distributing your bucket like - stablecoin, BTC, ETH and few other coins and having a diversified portfolio is always going to be useful.