Fixed price commitment - price increase after expiration?

Honestly, I find the matter more than clear. The arguments presented here precisely address why and how this price increase fully takes effect. Many parameters can be contractually agreed upon in advance, such as the duration of the price binding, what constitutes a delay and what does not, how much the increase is after the price binding, etc.

There is nothing more to discuss, unless the general contractor approaches you out of goodwill.

Why should the contract be in your favor if you have not reviewed and had it adjusted? The contracts are basically watertight and have been signed in this form dozens, if not hundreds, of times

I don't think that clauses may only be in favor of one party.

I don't think that clauses may only be in favor of one party.