Add more of a variety of vehicles.
So I love classic cars and I like the cars in the games from the 80s but I would like to see more classic cars, so for example cars from the 1950s, the 1960s, the 1970s, and so on. I'll list examples.

1972 Chrysler New Yorker
1974 Dodge Monaco Sedan
1970 Cadillac Fleetwood
1967 Chevrolet Impala
1975 Plymouth Fury
1958 Pontiac Bonneville
1973 Pontiac Catalina Safari
1977 Lincoln Continental
1966 Oldsmobile 98
1971 Mercury Colony Park
1974 AMC Gremlin X
1975 Ford Taunus TC
1957 Chevrolet Bel Air
1970 Chrysler Town & Country

It would just be interesting to see more of a variety in vehicle eras instead of the same 40 year span of vehicles.