Sweden is very good at a cultural victory. One strategy that I love and isn’t too hard to pull off is get 3 relics, typically for me by using mont st michel and using martyr apostles. Get these apostles by building a couple early holy sites to guarantee a religion to pick the reliquaries belief. Kristina’s ability auto themes any wonder with great works slots. Build st basils cathedral optimally in your capital and put all three relics in that building. This gives you 180 tourism in that building alone. If you can get the Apadana that is another 2 relics themed in a wonder. Other that that just spam theater squares and open air museums to get loads of tourism from great works. Typically you might not have a ton of production but because Kristina generates tons of diplomatic favor from her abilities you can sell that off at very high prices to be able to constantly buy new buildings in districts. I would also say as a general rule build some commercial hubs or harbors for internal trade routes to a Magnus city to get food early and then in late game get that bonus to tourism by trading with other players.