If a knife or pair of scissors becomes blunt, you don't have to throw them away, you can have them sharpened and they will regain their sharpness for cutting. In the past, there were specially trained and equipped professionals who travelled from house to house offering this service. So how is this sharpening restored? By using the same or a similarly hardened object. In other words, the scissors or knife regains its sharpness and thus its ability by grinding it against a hard or harder resistance. King Solomon in his wisdom once put it like this: "Iron is sharpened by iron, and a man sharpens the face of his neighbour". In other words: if you have lost a certain passion or perhaps you have become lukewarm and boring in a once vibrant area of life: go to where others still have this passion and rub against them.
I wish you an extraordinary day!