Question about Varys' questline

[Ser Loren Lannister]

   First of all, hello everyone! I started to play this mod 2 maybe 3 months ago, and it's wonderful. I became vassal of the Westerlands and I made huge progress. I have 1 million+ stags, Storm's End, Weeping Town, Blackhaven, a village, a small fleet and roughly 1800 soldiers in total. Long story short, I completed Varys' questline but didn't go with Targaryens. Because I didn't want to lose my fiefs, incomes, and relations. Later on I changed my mind and wanted to side with the Targaryens but when I talked to the Varys no options appeared and he said something like "Come back later.". I can't load old save because it's on circa 600 days which is too old. Actually I want to get King's Landing because I'm tired of training troops. To do so, I need to side with Daenerys. Thanks for your help! And suggestions appreciated!

[uygar123]

How you do siege.I can't do siege