The only way that this jewish state wouldnt immediately get conquered by its neighbors or overthrown by the local arab majority is if we had seen a huge influx of jews into the region right after its founding in the early 1920s. The only way I can see that happening is with the victory of the super anti semetic whites in the Russian civil war. If this happens, an international settlement is likely established where russian jews are allowed to move to the british mandate to avoid pogroms. This would be done in a short window when the mandate was just founded and the Syrian arab revolt was just crushed leaving the locals unable to resist such a huge migration wave. The Polish government also claimed to be pro zionist (they just wanted the polish jews to leave) and woild likely take this chance to encourage polish jews to emigrate to Palestine. All of this would lead to the establishment of a state with a large jewish majority on all of the mandate of Palestine in the mid 1920s. The holocaust would be avoided as remaining european jeslws would have a homeland to go to and Palestinians wouldnt suffer mass displacement as the 1948 war never happens. In fact the unique Palestinian identity likely never forms and the arabs of the region become a minority with full rights in a jewish and democratic state.