1. There is at least one study showing Lemon Juice it can lower uric acid levels in humans[1] seemingly by lowering PH of urine.
2. Tart cherry juice is mentioned a lot as a cure. There are a quite a few studies[2]. Make sure and get the tart cherry (Montmorency) juice, you can get it in a concentrated syrup. My uncle says he has not had an attack since he started drinking a generic supermarket tart juice every day. I have never had an attack whilst taking cherry juice but i haven't been taking it consistently.
3. Interesting article linking fructose and gout which matched my intuition a lot more than the link with meat - https://tim.blog/2009/10/05/gout/
4. Hot bath with epsom salts seems to temporarily ease symptoms.
I personally haven't noticed a correlation between eating meat / fish and gout attacks. I have gone from eating meat twice a day to about once a week now and there has been no noticeable change in the gout.
[1] https://www.sciencedirect.com/science/article/abs/pii/S03044...
[2] https://www.fasebj.org/doi/abs/10.1096/fasebj.25.1_supplemen...