This is a fairly active group with a mix of folks sharing resources and asking questions.
It is a private group, but they accept anyone that wants to join.
GA4Builder – Recreate UA Reports with a Click
Recreate UA reports in GA4 with one click.
Other Tools
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GA4 & UA Ecomm Dashboard
Get year over year data from UA and GA4, even if you didn’t get GA4 set up last year.
GA4 UTM Builder by UTMPrep
A UTM builder created specifically for GA4 with a channel selector and rules.