Two of Formula One's recurring issues are lack of testing for young drivers and races being lost because of cost.
Possible solution = non-championship races in which test drivers could be used and circuits pay a much lesser fee.
Possible races (including FIA grade 2 circuits) could include
Argentina - Termas de Rio Hondo, Potrero del los Funes
Australia - Albert Park, Phillip Islands, Eastern Creek
Austria- Spielberg
Azerbaijan - Baku
Bahrain - Sakhir
Belgum - Spa-Francorchamps
Brazil - Interlagos
Canada - Montreal, Mont-Tremblant
Chile - Codegua
China- Shanghai, Ordos
Czech Republic - Brno
France - Magny-Cours, Le Mans Bugatti, Paul Ricard
Germany - Hockenheim, Nurburgring, Sachsenring, Lausitzring
Great Britain - Silverstone, Donington Park
Hungary - Hungaroring
India - Buddh
Indonesia - Sentul
Italy - Monza, Mugello, Imola, Misano
Japan - Suzuka, Fuji, Motegi
Korea - Yeongam, Inje
Malaysia - Sepang
Mexico - Mexico City
Monaco - Monte Carlo
Morocco - Marrakech
Netherlands - Zandvoort, Assen
New Zealand - Taupo, Hampton Downs
Portugal - Estoril, Portimao
Qatar - Losail
Russia, Sochi, Moscow
Singapore - Marina Bay
South Africa- Kyalami
Spain - Catalunya, Jerez, Aragon
Thailand - Chang
Turkey - Istanbul
United Arab Emirates - Yas Marina, Dubai
United States - Austin, Indianapolis, Barber
It could open up Formula to new markets, return F1 to classic circuits (imola, Estoril, Zandvoort, etc) and provide opportunities for test drivers to get a chance. In addition, non-championship races could be less structured than a championship race, maybe not occurring annually or on the same date.
However, I do understand MONEY is a big factor, in relation to cost to the teams.