Is it possible to switch from the National Guard to Active duty?

You can search here and find all the answers to that one since it is asked about every other day. Here are the basics.
You need to find an Active Duty Army Recruiter, who will then fill out his portion of a DD 368 Conditional Release. You take that document back to your chain of command, where it will go up the chain of command to the first General in your chain of command or his/her designated representative. This process isn't fast, if it's done in less than 90 days, you are extremely lucky.
Now the bad news. Your chain of command is under no obligation to approve that transfer. I have not been Active Reserve for a long time, but when I was S1, it depended on how short the state was in your MOS, how much time you had already served, and general manpower levels. They have a dollar investment in you that needs to be justified.

Yes, it is possible. It happens all the time. The issue you might encounter is your unit releasing you. You have a contract with your state NG. A legal binding document. Therfore your unit is in no obligation on letting of the hook, particularly if they are short on personnel; even more on your MOS. Also, they paid your trainings a well. However, don’t let that discourage you from making the effort. Just be prepared for the long wait. Yes, it’s long process.

One of the reasons I discourage folks from joining the NG. From the USAR, isn’t that painful. Stills take some hustle, but not as much.

I've known several people who've done it. I think it's harder than it used to be but still possible. Talk to a recruiter and keep in mind that your NG unit would have to agree to release you.