Best junk data to delete from new macbook m3 after time machine backup from 10 year old laptop?

I had a macbook air for 10 years and it finally gave up the ghost. I have just got a refurbished macbook air m3 and restored all my data from a time machine back up I made a couple weeks ago. Im realising now that I have just put 10 years worth of important data and a largeeee selection of complete junk onto this gorgeous new sleek thing and I slightly regret it. I dont want to factory reset and blank slate it as the likelyhood is I will want lots of my data on this device but I am looking for recommendations on what things might be hidden or unnecessary in my data that I should get rid of to free up some space for the future. Im ofc going to do the digital detox of getting rid of old files, pictures and downloads but I am not a techy person so idk what else (junk) I should be looking for to get rid of.

Any advice would be greatly appreciated!! (Sorry if I have come to the wrong thread)