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>Stop giving Water types access to a ton of Ice moves
>make Rain Dish and Chlorophyll passive buffs like the Sandstorm Sp.Def boost for Rock/Ground/Steel types since it makes thematic sense for Grass types to be good in both Rain and Sun instead of being useless in both
>give Grass types access to Earth Power and Power Gem instead of having all of them run around with pathetic movepools full of just Grass and Normal type moves
>Give Fire's Fairy resist to Grass instead
If you really want to go crazy make either Flying or Steel lose their Grass resistance, it's pretty much impossible to be an offensive Grass type because every other Pokemon will roll up with a x4 resist.
At it's current state Grass sucks as both an offensive and defensive type, and before you say Tangrowth, that thing has a shitload if HP, a ton of sapping moves and Regenerator, it's a very clear outlier which is why it's one of the few notable grass types. Kartana is minmaxed as fuck and M-Venusaur literally removes Grass' two big weaknesses. All the good Grass Pokemon escape the vices of being a normal Grass type.