Unfortunately, it's not always clear as to whether my cash flow from stock market trading counts as capital gains or regular business income. I don't trade daily, but I do trade once every 2-4 weeks or so (maybe more if I have to exit when market gets volatile). And since I depend on that as a main source of income, I fear most tax jurisdiction would view it as a business/personal income rather than capital gains. It's why I tend to lean towards countries that have no personal/biz income or have low tax on it anyway.
Well, I'm cautiously optimistic but I figure in half a decade or so I should be able to live in Switzerland or Singapore easily with the cash flow and capital I'd have. Switzerland may be too boring for me though I'd love to visit and enjoy the nature there someday. I imagine Singapore is like Vancouver on steroid so maybe. Taiwan does have 20% flat tax option for foreigner expats. I visited there briefly so I can't comment too much. Hong Kong is kinda similar as Singapore I suppose I donno. I'd be excited to be able to afford visiting them and figuring it out for myself as to how I feel about these places we'll see.
Obviously living in said country is a requirement, getting around that is highly risky. Just renting is likely not to work, I don't know about Canada but in Europe border movements from outside the union are also tracked.
If 20% is "low" taxation for you then Europe has also many options. Estonia, Bulgaria, Czechia etc. Not to mention Cyprus which is far lower.
Maybe this is why I need to travel more often to appreciate what countries actually are but my stereotype says Taiwan is significantly better place to live in than ex-Soviet republics or Czech but I could be wrong on that. I've been to Taiwan and granted for a brief visit but it seemed like cleaner and more organized version of China and closer to South Korea/Japan, which I like quality of living wise.
It's not low, but once my capital becomes sizable enough scarcity of capital is less important and quality of life/time becomes more important. Hell, I might even return to heavy tax countries like Canada and UK if I am set for life. Who knows shrug.
Now's a great time for a vacation in Eastern Europe, just got back from there a few weeks ago. Almost no-one there, your choice of hotels or AirBnBs and since they're all empty at least for VRBO and AirBnB you can negotiate the price. You can justify the cost as a "fact finding mission"