Can you get one of those sleep sacks that allow for one arm out and the other swaddled for a bit ?
We used the halo swaddles! Did one arm at a time for a few days then still more tight around her abdomen for a few more days. Now she's in a sleep sack. She still moves her arms but usually her paci falling out is what wakes her up
My oldest transition out of the swaddle herself when she was around 7 months old at that time she new how to crawl and roll over she felt like she had a stray jacket on she liked her arms and legs free around 7 months maybe your baby just doesn't want to come out of the swaddle just yet
Maybe the love to dream transition one swaddle? You can zip off the arms
What I did is I used my halo but only wrapped one arm at a time. You can do that for supervised naps for him to get used to having one arm out. It took me about a week of doing one arm out and then switching to the other arm and then both fully out.