"What can I pay you" or "What can I give you." This can be made more explicit. AT: "What can I pay you so that you stay and work for me" (See: [[rc://en/ta/man/translate/figs-explicit]]).
The connecting word "But" can be used at the beginning to show that what Jacob is about to say contrasts with what he just said. AT: "But if you will do this thing for me" (See: [[rc://en/ta/man/translate/writing-connectingwords]])
# this thing
The phrase "this thing" refers to what Jacob will propose in verse 32.