One of the first things you need to do is to let the person(s) know that you want the role and that you’re looking forward to joining the team. This dramatically changes the negotiations to a “teammate” mindset versus an “us versus them” mindset.
The second is to understand how you might educate your future potential employer “why” you are requesting the specifics of the offer package. If it is money, make a cogent and evidence-based case for the increase which may include:
Full article here: https://upjourney.com/can-you-lose-a-job-offer-by-negotiating-salary