Only in the last few years, China has become more and more a headache for many countries. Disputes over the South China Sea, annexation of Taiwan, dispute over India's border, maritime disputes with Japan, create economic debt traps for poor countries. Countries such as the US, the European region, the US, Japan, and India are changing their foreign policy with Southeast Asian countries. From investment, economic cooperation to military such as providing patrol boats, warships, ...
The results after the wars force leaders to have a cool head so that things do not go too far. Along with that is the economic control in the region when a wave of boycotts of China pours in. Many factories, production facilities, and economies are important and relocated to Southeast Asia. At the same time, countries such as the US, the European region, Australia, Japan, and India are also constantly promoting diplomatic relations such as donating maritime patrol boats to provide military weapons to create a balance against the enemy. China's unrelenting influence. During the epidemic, the market went sideways, AXS a product with a combination of Vietnam and Indonesia is creating great attraction. Suggesting you more about the nature of this area with the sea, mountains, and different cultural features is enough to make you feel alive. From my perspective, this will be an area that develops very quickly after the epidemic, leading to the development of new unicorns.
If I understood correctly the title of the post and the introduction, the answer is:
1. China. At the moment, China, slowly but surely, is trying to regain its status as a regional (Southeast Asia + nearby regions, if possible) leader. For many years China, "restrained" played the role of a country that provided cheap labor, a convenient site for the location of production, etc. But in fact, China was accumulating technological, industrial and military potential. And today he stopped playing in the "mask", and almost openly declares - "I am a leader in the region, I am a key player here, I am a key part of the world economy, I am strength." Yes, it must be accepted. China is waging a delicate competition in the region, China is playing a power game with some countries that expected their support on the world stage, and now China is "twisting their arms" and forcing them to take advantageous steps. The question is how realistic is the theory about the change of world leaders, namely, the "fight in the arms" with the United States. Be that as it may - at the moment, China's economy is more export-oriented, and without a consumer market, it will simply self-destruct. For China, the US and the EU are now consumers, without whom they cannot manage their overheated economy. The potential for them is new regions - Africa, Latin America, Oceania (Australia, New Zealand, Indonesia).
2. Which regions will develop ... This is a difficult question. There are many nuances here. For example, one would expect that India's pharmaceuticals will give a big boost to its economy, but there periodically there are outbreaks of Covid, which cause huge losses to the economy. On the other hand, regional tourism "leaders", countries such as Vietnam, Thailand, Sri Lanka, Laos, Indonesia, and others that I did not name, due to their high dependence on tourism, which has almost reduced to 0, WILL BE FORCED to look for new niches where their economy was able to earn and compensate for the losses from the inaccessibility of tourism.