The more pieces you get into your Lost Zone allows you to open other options up, like attacking with Sableye [Lost Origin], which can take complete control over the late game
If you need the money for rent, bills, an emergency, or something that meaningfully improves your life, sell the cards
With only 90 HP, Octillery is easy prey for Guzma, so you may want to include cards like Orangurus Instruct Instruct: Once during your turn (before your attack) , you may draw cards until you have 3 cards in your hand
You cannot Flip Summon a monster in the same turn it was Summoned, Normal Set, declared an attack (even if the attack was negated or cancelled), or if its battle position was changed manually that turn
That said, is a little expensive for a card like this
Melmetal 117/162 Loading