2 things to try:

1. Leave the village and come back later (maybe 20-30 mins?) to test if the golems are still mad. This might work but I'm not sure.

2. Kill every golem. The villagers will have worse prices but those reset after a little while if you don't kill them or hurt them. This will work if every golem is killed and you don't hurt another villager.

I've killed a lot of them, but it doesn't help

You have to kill all of them until there are 0 left at any given time. If that doesn't work then I don't know what will.

I've got 40 iron. When I walk there are any golems, but they spawn again. I play 1.16.4

I've killed the all, but when I go away from the village they spawn again

If they spawn and are still angry at you, I don't know what to say. Sorry.

Thank you for your time :)

Oof - you made a big mistake. Your player "reputation" decreases every time u hit/kill/harm a villager or iron golem. And killing golems WONT solve the problem either, the more you kill them, the lower your reputation, and then the harder it is to get back up on your feet. Plus, a new golem is summoned every now and then to protect the villagers, if the previous is killed.

1) Either don't visit the village again

Or

2) Increase your reputation by trading (or winning raids but im not entirely sure) which can be a hard process since you will need to trade A LOT to earn ur rep back and still be hunted by golems in the meantime

Big thank you