My brother did that to The good 46 the bad 99 the ugly 93 shirt. He said shopping is hard when we don’t need anything and could we just stop. I said I didn’t want to stop I wanted to at least get him a bottle of wine, his wife said put my name on it to. So gifts became only if we find a perfect thing by accident, no stress about shopping. For my boyfriend one year he was broke and I suggested we skip Christmas gifts he was thrilled.
I cut all the nieces and nephews off The good 46 the bad 99 the ugly 93 shirt by cutting way down to one tiny gift per family so like a plate of cookies or tin of popcorn or ornament they would get me something like a gift from the dollar store from the entire young family. So we had tiny wrapped gifts without the stress. Now I am elderly and only get or give a gift if I really want to or tell them I might like something. So I suggest you send a note in the summer before they shop and say you wish to reduce the stress of shopping and quit exchanging with them, or you can talk in person. Some might not want to quit but ask to cut back to token gifts.