I hope such a question would be permitted even though I'm afraid it might be a bit too general.
For context: I'm in my mid 20s, and I grew up a Russian speaker (living in Canada so it's not like I hear the language on the street) even though all my relatives are from Ukraine (Kyiv or Chernihiv). It's just what language has been spoken at home for many generations. But it's not like there was no exposure to Ukrainian either because there were always some books in Ukrainian, or even music.
I've always been curious about Ukrainian, and I've made a point especially following 2014 to learn a bit. I listen to music in Ukrainian and sometimes come across stuff written in Ukrainian. For example, as long as it's not too technical I can get the general idea of something written in Ukrainian on this site. I'm better at reading than oral comprehension - partially because it gives me time to think through pitfalls (e.g. питання has nothing to do with torture) or watch for what would sort of work in Russian but not in common speech (e.g. місяць / месяц for Moon).
To me, online resources for learning Ukrainian seem to be geared to someone with no knowledge of any Slavic language. Because I'm comfortable in Russian, I feel like it simultaneously gives me a big advantage from similarity in vocabulary and grammar and a big disadvantage because of differences in vocabulary and grammar. If I were to try to write all this out in Ukrainian, I fear it would come out as ungrammatical Ukrainian with Russian calques and maybe some Russian words with a vowel changed to і.
My question is thus: are there any resources online that would be helpful for a Russian speaker to improve on their Ukrainian? Or, is there any advice for someone in my situation?