@MK3386
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In general
(a) if your tax status for the tax year 2023 and 2024 is indeed Non-Resident ( and filing form 1040-NR), then your are taxed by the USA ONLY on your US based income. So any foreign earnings are not reportable / taxable by the USA.
(b) FICA tax exemption is not based on whether you are a tax resident or not -- it is generally exempted for persons in training such as students/ OPT/CPT etc. You can also escape SECA ( the FICA equivalent for considered self-employed ) if you are participating in Social Security Equivalent ( of your home country in your case ) if , and only if , US and that country has a totalization agreement in effect --- thus you pay only to one country.
(c) A point to consider , the Swiss pillar 3a, being a private and not mandatory, can be classed by USA as a PFIC, thus requiring gain/ earnings recognition yearly. This depends on the entity that you are investing in .
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