iodéOS (which is based on LineageOS 18.1) is available for FP4 : https://iode.tech/installation/#1648127872188-649c78df-afd9
and /e/ OS (also based on LineageOS) is also available for FP4: Info about Fairphone FP4 - FP4
iodéOS (based on LineageOS 19) and CalyxOS are available for testing. However, I would not yet use these for an FP4 as a daily driver…
Since you are coming from FPOpenOS, iodéOS might suit your needs best.
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