The biggest problem as I see it with the crafting system is that there's no sense of progression. Previously you could trade up your cards to higher rarities; if you got a good loadout you'd keep it, otherwise it would just be more fodder for trading up. There was a lot of RNG involved, but it always felt like you were improving your collection.

With the new system you spend a large amount of credits and components to create a card, and if it's not a good loadout it just feels like you wasted a lot of resources. There's no silver lining to that scenario, and when you get a bad card it feels like you've take a step backwards overall rather than progressing.

Therefore, I think you should be able to upgrade cards to higher rarity. I don't even care if it's very expensive, at least there would be a clear path to progression.

Something like

• Bronze -> Silver: (components from 50 lead cards) 25,000 credits
• Silver -> Gold: (components from 100 lead cards) 50,000 credits
• Gold -> Cobalt: (components from 200 lead cards) 100,000 credits.

The prices could be double or triple that and I still think it would be preferable to the current system.

edit: There would still be some RNG on what skin the loadout had, so maybe also add an option to re-roll the card at the same rarity but with a random skin.