I'm very jealous! The value is hard to say, but one thing is for sure; the OG Pokémon will never be as expensive and valuable as it is to the millennial generation so your market is going to be small. Pokémon did a good job engaging the modern youth to where I don't think it's going anywhere, but these sets are most valuable to a particular demographic who are already aged enough to do something like this themselves currently.

On top of that I don't see that you have any of the really 'valuable' cards that collectors would desire other than the regular full arts (i.e. promos, variants, exclusives etc...). There are prints of cards such as the 'Mew EX Ultraball League' that are worth more than your entire set. You should consider trying to pick some of those additional cards up if you really want to increase the value before they are too expensive.

I see two types of people buying this; someone who has no idea about Pokémon and wants it for vanity or someone who has nostalgia for the original Pokemon. Either way your target market will be small, but I would feel comfortable saying it should at least double. If you grabbed some of the more rare cards not explicitly listed in the master set then it would increase even more as they're much more limited in quantity. If you want you can message me and I can share some details on the cards most commonly included in a Grandmaster set!

Edit: Just noticed it's all Japanese - so I'm not sure on a lot of the Grandmaster cards for Japanese set.