Let me thorw out some ideas:
First would be to split FIFA into 3 organizations,
A group of the 50 or so largest national/country members, those with significant professional leagues, they would retain the rights to the World Cup and major tournaments as well as regulation for professional national leagues.
A group for the minor countries under a certain population and with no or few professional leagues;
A 3rd group for the non-profesional and youth (under 18) leagues.
Second, any reform must include, as done in part with the IOC, strict and transparent processes as to selection of host cities for major events, elections of officials, strong anti-bribery and internal disclosure of financial information of individuals.
Third, major cuts in pay, benefits, travel expenses for officials, limits with demands for treatment of them by national members.
Four, a total redo of broadcasting rights, in transparency and choosing who can do the job best, not just how much money they will pay or bribe to do so.
Five: Sponsors, especially the biggest ones, need to put pressure on any and all reforms and demand a renegotiation of current futures.
Six: Withdraw the offer of the WC
and related tournaments to Qatar. It may be too late for Russia as would be a political disaster for the USA and EC
, but they do have most of the facilities and have a significant professional league. The USA has a major military base in Qatar so may have a real conflict as to them, although they don't have most of the necessary facilities nor have a significant professional league.
Seven: Fans of The Game must put pressure on their National organizations and government to work with reformers or risk losing their elected or unelected jobs.