Big Budget - Need Help/Suggestions!

Hello and thanks for taking a look! I'm a newer MUT player (first since 2016), I've done a LOT of grinding but don't really know what to spend on. The uncertainty is making me hesitant to make any big purchases so looking for some advice from the community.

Coins - 3.5 million but would like to keep at least a decent chunk of that for future upgrades and to have coins for any investments, sets, etc.

Offense - Balanced offense. Mainly run a few different shotgun sets. I suck pretty bad tbh so I don't have a "go-to" I'll probably start experimenting with other books.

Defense - Ravens D. Run mainly nickel and zone setups. Mix some 3-4 and dime in, but dependent on opponent. D is where I'm most lost, I don't know where I should be upgrading for what I'm running. Seems like I need all spots covered with mixing D looks like I'm doing.

Lineup - https://www.mut.gg/24/lineup-builder/0d4da672-43e8-46fe-89e6-d35b921b794a/

Bruce Smith (RE) - Very good card for his OVR. I have found him to play better than players at position that have a higher OVR than him (such as Myles Garrett, Von Miller, etc).

Darrelle Revis (CB) - He is one of the best corners, if not the best in the game. 90 Man/90 Zone. He is the way to go!

Terrel Bernard (MLB) - One of the best LBs in the game for one reason: Lurk Artist. LBs in previous years have been horrible and never get good animations. This changed when EA introduced Lurk Artist recently. This ability has single handedly made LBs viable again. Please note that Lurk Artist is only available on current gen consoles, not old gen.

Dave Robinson (LOLB) - Expensive as hell? Yes. But he is one of the best cards in the game. He is the only LB that gets 90 Man/90 Zone AND he gets Lurk Artist. He is a true game-wrecker. 

Charles Cross (LT) - Good upgrade at LT. Gives motivator chem boosts just like Creed Humphrey (who you happen to already have) does.

Quenton Nelson (LG) - Good upgrade at LG. Not too expensive compared to other options.

Will Shields (RG) - Easily the best RG in MUT currently. Shields, along with Cross and Nelson, should last you for a good amount of time before becoming truly outdated.

Not sure if this surpasses your budget. If it does, I would focus on upgrading defense first.

As always, be on the lookout for upcoming cards, as EA might decide to drop a crazy good card out of nowhere.

Hope this helps!

Much appreciated. O line is one area I wasnt  sure if it was worth the coin, thank you for the suggestions.