I recommend using baby powder on your bed, body, dip etc to activate your senses. When I smell baby things it always makes me regress faster.
Then with activities; there are youtubers who are caregivers that read stories to you. So you could listen to those while having paci or a nice warm or cold drink of your preference in a cute baba or sippy. Or watch some cartoons or Disney shows while doing that. Have your plushies around. Also if you have little friends you can VC or video and have play dates where you can show each other your plushies and babytalk. Other things would be coloring, going to the park, or even just going in your yard and play with the grass, sticker books, activity books, singing, crafts, playing dress up and taking cute pics in them, playing baby games (I have some on my phone), little snacks like applesauce etc. I highly recommend you to watch Littles who post on YouTube. They have lots more ideas too.
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