The little money you might net between the sale of your Miller and buying something like a Regal wouldn't buy lunch for a week. Keep your accordion and see if there is some way you can raise the jingle without selling it.
I have a C and a D Bon Tee Cajun from Larry via a very good friend who sold them to me. Larry's boxes are really good accordions. My D is a screamer and the C has a big fat sound. Both play easily, unlike the ones I bought from Birdman and the Savoy that the Birdman "repaired" for me.
Good news that you're keeping it and better news that you will play for some people. Ironically this good news comes on the day when the horrible news arrives that Larry's shop burned down. You are lucky to own one of his accordions. They are treasures because they are great accordions and they are made by a mighty fine person.