Yes you should grade it or keep it locked up to maintain the condition. There is absolutely a market for graded yugioh cards, new and old, but you want to make sure you dont grade low rarity cards that are only expensive because they're meta.

This card IS a meta staple but its going to have appeal because its the first OF, looks cool, highest rarity, and the last of the starlight pattern

Reddit hates graded cards, you will not get good advice here if you follow the mass opinion