You have a 9 speed MTB groupset on the bike, top end 9 speed MTB is Alivio, which is only just above what you currently have. Going to Deore will require (additionally) new shifters, cassette & chain, if going to a road groupset, you need to look at the cage length/max T count, all of this will be expensive, and none will result in any significant improvement in shifting.

Would do some research into the groupsets, their position in the Shimano hierarchy & compatibility issues if looking to mix & match, Sora is a low end road groupset, 105 mid range & Atlus (MTB)is a step below what you currently have on the rear.