Fix and optimise existing ga account

Looking for a true google analytics data expert for a one off project with a view to long term relationship with ga and data studio.

This post is for an initial project of fixing and optimising our current ga account as follows;

assign correct tracking of existing channels, in particular affiliate (awin) and our email marketing is showing under other, they should show under affiliate and email respectively.

ppc is split under brand and generic and ppc. Needs to be top level ie ppc (we can then use labels etc if we want to go granular with ppc such as brand, generic etc)

second main issue, many sales not tracking in ga, need an expert to identify and implement a fix so all sales from web are tracked in analytics.

Please make your best proposals with a view to additional work with ga4 and data studio.