I mentioned that sacrifice is a key. The real key is service.
When I was growing up, I had a list of chores to do, and there were some things that I had to do for money or whatever. Service that causes you to sacrifice will get you out of your funk. I mentioned earlier about my friend that was in a funk. This is one of those friends that would do anything to help someone out. One of my sons was broken down on his way back from visiting his kids in another state. This was the last day of a holiday weekend, and he was broken down in the middle of nowhere with few options. I called my friend who had a big diesel truck and asked him if I could use his truck. He found a trailer to borrow after we got the tires fixed and hooked it up to his truck, we dragged it about 370 miles away to get my son and his expedition. We used a come along to drag the rig onto the trailer. Then we started back home. It was well past midnight when we got there, and the trip back was slower than if we were driving without the loaded trailer. By the time we rolled back into town in was about 6:00am and we started work at 7:30. Both of us worked the whole day. The sacrifice drew us all closer together, but it also felt good to do something that was so far outside of normal for somebody that it made us feel good. I know that the experience kicked the funk out of me, and I expect that it did the same for my friend.
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This kind of person is the easiest to un-funk. Show them an example of somebody that may have a difficult time that they are going through and ask them if they wouldn't mind helping out. He had a chance to go and fix a frozen water pipe yesterday for somebody, and if that didn't help him out of his funk, I will find a little act of service that he can do to help out a member of the community. Hopefully someone who is having a real hard time with something like a widow or a homeless person to help out. I like to work in the yard and make things that I like to grow or take the dog for a walk or whatever. If it is a particularly bad funk, I will find a way to help someone to have a better future and try to influence a positive change in their life.