You are right if you say that the more countries allow and accept bitcoin, the higher the price of bitcoin will be because of course demand will increase. Moreover, if big countries like China accept and support bitcoin, this will have a good impact on bitcoin. and of course we as crypto lovers will benefit from our coins
Most countries now allow everyone to buy and sell Bitcoin and even tax their citizens and yet it's not the reason why Bitcoin is where it's today but it's the adoption growth that gave Bitcoin value to where it is today. The countries that has allowed people to buy and sell Bitcoin role is the only thing that can make Bitcoin more demanding. If a country like China which has larger population make Bitcoin a legal tender today and Russia do the same, Bitcoin will explode and can go as high as 500k before these years end but they are not doing it and this why Bitcoin still has a lot of place to go.
You are right that many countries allow it to be used as investment and trade, but there are still many who do not allow it to be used as legal tender and still use their country's fiat. China has a large population, and it should be known that it used to be the largest bitcoin mining area in the world, but because there were certain interests, it was finally stopped and not allowed.
It is difficult for China to legalize bitcoin there, because they still want to be able to intervene in everything, and it is difficult to do this because no one regulates bitcoin and moves on its own due to trade. Even without China, bitcoin at the end of this year will be able to move better and until the beginning of next year with the latest ATH.