The righteous way to reduce the archive

That black day came. I am out of storage space on my file server, and have no more room to store photography.
One would suggest just buying another one disk, or replace current disks with ones with larger capacity. But I should not take this extensive way. The increase of storage space will not empty the excessive data, and hgst drives are too expensive. The righteous way seems to be to systematically reduce the number of photos and to cease, at least temporarily, its replenishment. So this way is kind of no-photos vow. So some photography which will appear in my blog was created in some time in the past.