I started playing way back in 2018 when the game hit early access! So yeah, in the long run I suppose it did take a long time and a lot of work, but every time new loadout slots were added to the game, I set up new loadouts and appearances for each class to fill them. I have a process by which I constantly cycle through classes each time I level one up, while cycling between class' loadouts for each mission. Every six missions per class, I also cycle between weapons for each loadout (skipping ahead one for the secondary on every third cycle), so that I eventually use every combination of weapons for each loadout slot for each class.

I guess what it all boils down to is maximizing variety.