Price the work, not the client's budget.
Estimate honestly
Break the project into the hours it will actually take, including data cleaning, which is always longer than expected, and the revision rounds you offered. Multiply by your rate. That is your floor.
Include the invisible work
Scoping calls, reading the client's prior drafts, documenting your method, and writing up. These are real hours and they are routinely left out of underpriced proposals.
Account for the service fee
Researchor's service fee comes out of the released milestone. The figure you are paid is shown before you accept, so check it against your floor rather than the headline fee.
Undercutting
Bidding far below the field does not read as good value. It reads as someone who has not understood the scope. Clients are warned in our own help content to treat a suspiciously low bid as a warning sign.
Raising your rate
Raise it as your delivery record grows. A strong review history in a specific method is what justifies a premium, and it is the thing clients actually pay for.