I pretty much always create a scripts folder in the same project and activate that to do my development.
julia> mkdir("scripts"); cd("scripts")
pkg] activate .
(scripts) pkg] dev ..
(scripts) pkg] add Revise Plots
Recently though I’ve made Revise.jl and BenchmarkTools.jl global which is nice. I try not to have Plots.jl globally because it’s quite a heavy package.