There is currently no size limit op_return your node won't consider a valid block. Currently it is only enforced by not being passed in mempool. Anyone can go straight to a sympathetic miner and drop 100Mb op_returns into every block. That means there is no such thing as a "full block" Want proof? Go look at Loops timeline and see that one of the first things they did was push an op_return 4x the current "limit" then brag about it.

So you're saying we already have big blocks with no limit? Got any code files I can verify against?

Alternatively, drop a 100MB block here:

Slipstream | MARA Holdings, Inc.

So you're going to Knots?

I already run knots