Making the most of writing a review paper
Writing a review paper gives you several opportunities. Especially when it is invited an published in a renown journal in your field. But the purpose can not be to use or optimize towards a funding proposal. A review paper should serve your community and especially new researchers in the field. The chances I see are:


doing a complete review of the literature up to the time the last related review was published. When do you really have the time to do this in time of information overload and time pressure. Now you are asked and paid to do this
outlining interdisciplinary relations to your field that emerged in recent years or which are prospective
making yourself a name in the community, review papers are often very much cited, but this also means you should take your time to judge very thoroughly which results published in the field in the past you should push into the foreground to not offend some peers
contact other peers in your field to ask to review the article before submission and discuss with them. In a big field you will not be able to judge importance of all publications on your own and you will need the help of peers to decide what has to be referenced and maybe explained and highlighted in detail
outlining what the open questions in your field are and suggesting new PhD topics to students. Often also so called "roadmap" or "opportunities" articles are published, so you chould check if recent articles of that kind exist.