I've just managed to get the larger backpack modification and the increased sprint duration (bigger pockets AND lungs!) This has been a game changer for me; it saves so much time. What were your game changers in suits and guns?
I did a bit of everything at first. And sucked at them all. Fortunately not a very expensive rebuy. Found a G3 Maverick suit, and things started to become... possible. I heard there's a "sharing is caring" site, where cmdrs who find a G3/engineered suit or gun that they don't need.
Now-- I'm very fond of slaughtering settlements full of pirates and looting everything. I'm Space Nice but Settlement Naughty. Took me years to find this out.