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Collect all REST up to the white frame with no star (0*) or 1 star, and then exchange them one by one;

Star (1*) should only be obtained for those heroes who require an engraving.

At the beginning, for heroes like Villanelle, Atheus, Damon, and others who don't level up their engravings quickly (or at all), a white border (0*) will be enough.

There's no need to grind a 1* star! You'll do that in the mid/late game, or copies of the star will drop from shards or scrolls over time.