Rankings fluctuate widly?

So I started a new website two weeks ago with 500 EMS and have couple articles in there. I also bought a PBN service from the marketplace and have them drip feed for 30 days. So far, Ahrefs has found 55 backlinks from 44 domains with Domain Rank of 33. Yesterday, my homepage got to page 6 and I was pretty excited as this is my first time ranking a webpage. Now today I checked again and it doesn't even come up when I searched my keyword. This sort of thing has been happening for the past couple days where I would go from page 10 to 8 then 11. What am I doing wrong? I am still on page 6 when I looked on mobile devices though...

This is completely normal. New sites dance up and down the serps, and disappear only to reappear. Give it one - two months and it will stabilize.

Very common OP for this to happen. This is referred to as a "Google Dance" and it will take
time before your rankings stabilize. Nothing to worry about for now, just make sure your
backlink portfolio looks diverse.

I agree with above, my latest link building resulted in 2 week heavy dance, which ended up with strong and stable rankings

As rabbitking said its common and known as google dance, hopefully you will see it back in couple of days and this time with improved rank.

You really need to give some time to get your site ranking stable at least 90 to 180 days. Apart from this, rank fluctuation sometimes happens due to the conflict between the Google panda & Google normal search engine.

While its normal and you should be patient, it is equally important to have a reliable rank tracker instead of manually checking for rankings.