55 cards are, er, a lot of cards . . .
That being said, I've often seen people post here that they wouldn't be able to use this or that deck because it was missing a card, wouldn't take a significator out of the deck because it would no longer be complete for reading, etc. etc. . . .
And when I see posts like this I tend to think--well, so what? The rest of the cards are all there
But, of course, that's just my opinion. I am, to the best of my knowledge, not missing any cards from any decks at the present time. Knock on wood.
ETA: One thing you might try is using a complete deck (I see on your profile a Hanson-Roberts?) for your main spread, then pull a card or two from the partial deck at the end as enrichment . . . this might be a good way to make use of it & develop a relationship with the particular cards which remain.
Given how few cards these are, maybe your guides/higher self etc. want you to take particular note of them