You can burn cleansing herbs such as Palo, cedar, lavender, etc.
You could make a protective crystal grid around your property/flat with 4 black Tourmaline crystals and place one in each corner of the flat. Tourmaline transmutes negative into positive.
Here’s a post about cleansing:
Good luck on your move and may you find peace and comfort wherever you go!!
When a friend of mine moved in to get new home, her baby would not sleep in the bedroom and she always felt uneasy. I left salt in bowls at the corners of the room for a night and I did a personal cleansing spell in the room. The baby started sleeping in there after that.
After my problems in late 2020, I cast a circle around the home I’m living in currently. I didn’t want negativity to find it’s way to me since I attracted it like a moth to the flame. I think Megan has shared ideas about that but I can’t find them right now. Personally, I just walked around the property 3 times and then came in and did my spell.
Yes, salt does absorb negativity! I did a salt cleanse with a clear jar of water and sea salt. I forget the actual ritual/chant, but the point is, over a couple weeks you could see the salt building up and the water being absorbed. It worked so well!! I might have to do it again.
This is a very good recommendation mentioned by @christina4
As well as the salt and the other witchy charms.
You can also feel free to use regular protection incenses of your choice. For me I would place the cleansing herbs or incenses at the four corners of the house and then place a white or black candle in the Centreof your home as you chant or say a spell for protection of your choice based on your intentions.
All in all the others have given advice and opinions that are very beneficial for you.