VPN activation with alt account, can Steam track down my main profile?

Track down your main account? Valve will track you down in person and break your limbs.

Probably not, but why would you risk it?

Accounts aren't linked in any way, so I don't see how they could. In Valve's eyes it's a whole new account, only you know it's an alt.

Only the account causing the violations would be in danger.

You will go to jail bro

Theoretically, yes, if you log into both accounts using the same computer and the same client installation.

One easy way to tell how closely Steam connects your accounts is to go to Steam > Settings > Family and see what accounts it lists as eligible for family sharing.

Create new account with VPN active in region from where you want get games, activate them, play them (with VPN ofc) for around 1 week.
If something goes wrong, like ban/suspend, you were on vacation in that country and bought some games there, airplane ticket photo recommended.

gabe is illuminati hes reading all this.

Few years back, my acc was suspended because of VPN. Not only that, my second acc was suspended as well.
So the answer is yes.
After they will see some suspicious things (for example cross-logins in various counties), they will suspend your account and possibly all accounts related to your computer and IP address.
This was also my case and I had pretty hard time. Just dont do it, those few bucks are not worth it

Steam doesn't lock accounts anymore when dealing with VPN, you just get permanent community ban.

Alt accounts are allowed. I've straight up told support I have multiple accounts that I used to use for TF2 idling.

As ageofarmageddon said, it's very unlikely that they would ban all accounts accessed from your IP. There is no way of knowing whether they could be family members or friends so they simply wouldn't do it. They would likely only lock the account which used the VPN, if at all. I personally don't have experienced with VPN activations so I'm unsure.

There is always the chance it could be worse. You could get an employee on a bad day or perhaps they change their policies. For the most part, only the account using the VPN would be at risk.