Dorwinion has only 1 allied/friends, which is Woodland Realm. I think Dorwinion should be allied/friends with more faction:
Dale (Allied) (Important) Reasons: They geographically close to each other and have close ties as mentioned here https://lotr.fandom.com/wiki/Dorwinion#Description_and_inhabitants
Gondor (Friends) Reasons: They were part of Gondor before, so I think they should be friendly to each other.
Lothlorien (Friends) (Optional) Reasons : They have close tie with Woodland Realm (Dorwinion Allied) and Elves shouldn't neutral to each other.
High Elves (Friends) (Optional) Reasons : Same as Lothlorien
Enemies:
Rhudel (Enemies) (Optional) Reasons : As Rhudel is enemies of Dorwinion Allied (Woodland Realm) and friend to it's Mortal Enemy (Mordor).
Please forgive me if some information is not correct as I'm not a real fan of LOTR movie. The main purpose is to have Dorwinion allied with Dale.