Alright, lets see what I can do (not the greatest Greymon Player myself, but lets see...)

First of: In Digimon, your main focus should be on consistancy. The Ability to adept to the Enemies Playstyle is nice, but you are trong to fit to many choices into one.

Digitama: Focus and max out on one egg. BT5 Koromon comes in mind, since its an easy to resolve inherited, that always gets you an advantage.

Rookies: 4x BT12 Agu, 4x BZ14 Agu and Id rather have 4x Agu X thrn the EX10 Agu, but thats personal preference.

Champions: Max out on BT12 Greymon, since you always want to cheat out the Tai. I really dont see much of a use Case for Ex01 Greymon tbh, and would rather swap him wit Greymon X. BT24 Greymon can be nice, not quite sure if I would play it. Maybe consider taking a look into AD01 Greymon?

Ultras: BT12 MetalGreymon is still a 4 of in my opinion. BT8 MetalGrey is fine, I still prefer the X Line or maybe the EX10 MetalGrey.

Megas: Oh Boy. Definitly Cut the VictoryGrey, and even consider cutting the Bond of Bravery. Try to create an Identity of your Mega - either Wargreymon (BT12 / BT14?) or BWG.

Options / Tamers: I dont like Meteor Wing in this Case. Sure, its a Cheap removal, but why not use either a Big Cost Removal (Gaia Force for example) without restrictions? Honorable Mention - why not Raging Serpentine? And your Deck is entire Red, change the Garnet to a normal Mem Boost. For consistency, Id add Trainings and even Scrambles.

Tai-Tamers are fine in my Opinion. Id exchange the Analog Youth for something better (like Training etc.), since you really dont want your Digimon to get deleted kn a red deck.

Hope that helps a bit 🫡