This is nonsensical idea. An ethnostate for everyone is a liberal fantasy.

Liberalism and ethnonationalism are mutually exclusive. The only nonsensical idea is this one.

Common sense and masculinity dictates that they expand into other countries.

That's what armies and wars are for.

Respect muh borders and sovereignty is liberal drivel that works only under an American enforced world order.

Except that is 100% untrue, mass immigration and leeching are mostly modern inventions. Look at the progression of world borders throughout history. If your idea was true, then we would be a united Earth under one group of people by now. There is a maximum level of expansion. A single government and group can only expand so far before stretching too thin, having a civil war, or other calamity befalling it.

This world is falling apart in front of our eyes. As American power wanes, the future of micro states grow grim. Azerbaijan just took a bunch of land from Armenia. Russia took crimea from Ukraine and is en route to annexing Belarus. Turkey is annexing parts of northern Syria. A world of ethnostates for everyone is utterly impractical without a global hegemon to enforce it.

Your definition of "microstate" seems to be VERY extreme. Austria, Armenia, Belarus, etc. are very large tracts of land with millions of people residing in them. And yes, of course their neighbors have historically wanted pieces of them, but this is a consequence of religion and politics: Russia feels Belarus, a historical substate of them, should once more be under their direct governance. Azerbaijanis and T*rks undoubtedly hate Armenians for being practically White and Christian (Jihad, and so forth). Austria has historically been in conflict with Italy and Germany over Church disputes and political squabbles.

If America vanished tomorrow, there would be nothing to stop Russia from simply taking over Ukraine, Belarus and the balts. There would be nothing to stop Turkey from taking over Greece. There would be nothing to stop Iran from taking over Iraq and Saudi Arabia. An Iran like that could hold the entire world hostage with its oil power.

Again, I don't see how this is relevant. Yes, of course tehre will always be land disputes. I never said a world full of ethnostates would somehow remove war completely.

Reality is that small nations have to be part of a larger realms in order to have protection. The microstate of Austria can't defend itself, however as part of Germany it can and project power on a global scale.

This is wholly untrue. Look at the Austrian and Austro-Hungarian Empires. Being engulfed into Germany in the 1930s obviously helped Austria in some ways but to say it can't survive without that happening is completely false.

You are a teenager who hasn't thought this through yet

The first part of your statement is true, but the latter is not. Just becuause you want an excuse to go on a global crusade and wipe out anyone you don't happen to like doesn't mean that I'm somehow wrong for disagreeing with your "ambitious" plans.