There are people who are reluctant about US stocks for fear that the yen will appreciate in the future, but exchange rate risks do not affect performance over the long term, so you can ignore them.
For example, there are people who are afraid of exchange rate risks and invest only in Japanese stocks, and Japanese companies that invest in them have exchange rate risks. In fact, export companies, starting with the Japanese manufacturing industry, tend to be weak when the yen appreciates, so it is impossible to escape exchange risk by investing in Japanese stocks.
If you want to completely eliminate exchange risk, you have no choice but to refrain from investing. However, since the value of currency gradually declines over the long term, not investing is also a risk.
In other words, no one can completely eliminate all risks, so I think it would be wiser to ignore exchange rate risks that do not affect performance in the long run and invest in US stocks and emerging market stocks.

Thank you, if you have any tips, please let me know!