I do not have much knowledge about the current concerns regarding Tether as to whether they will have an effect on it as a stable coin or not. If I were in your shoes then I would simply switch to fiat and Bitcoin. Bitcoin may equally not be stable but it has always been a good choice.
Bitcoin is indeed the main choice for investing. but I personally still hold tether for long-term investment. the issue that happened did not make me panic, and it would remain in the analysis that I had planned