You don't need to keep Hacking, Lockpicking, Mechanics and Electronics maxed. Your agility is at it's lowest so putting points into Evasion won't produce optimal results... BUT it will reduce damage from explosives so you might want to keep some.
You don't need to max Social, as well. You might want to go with only one Social, but that is up to you in the end. I lean more heavily towards Mercantile.
I would put some small points into Pickpocket, Lockpicking and Traps. That will help you get your funds started as well as help you notice traps from the very beginning of the game - you are, after all, a new player to Underrail so being able to spot traps is a huge QoL improvement for you. After that I'd just slowly put points into both up until about 50. Your high Dex will further scale those up.
Do not ignore Throwing and Chemistry - these two things alone can make some combat encounters a breeze. Do not ignore Tailoring, as well. In combination with the other Crafting skills it can give you armour with defences specific to an encounter. You won't need to max Throwing as it will scale off of your high Dex.
For starting feats I'd consider Pack Rathound and Aimed Shot.