At what level is it more interesting and better to stop?

Actually, if you want a card level, I suggest 89 or 69. People at these two levels still play more at the card level. If it is a new district, 69 may be a little more. If it is an old district, 89 is a little more, but I still recommend 89. After all, you can open the gobbledygook system after 89, and you can combine and play more, but 89 pairs of equipment and babies are relatively better. (69 mainly depends on babies and people.