I don't think Nico Williams' decision to stay at Bilbao was a smart one. Remember that Nico Williams became a hot name in the summer transfer window because he won the EURO with the Spanish national team. He did not become famous when he was at the Bilbao club.
I think the reason he decided to stay in Bilao is because Barcelona and PSG haven't made any attractive offers to Bilao.
~Snip
Yes, it's a shame that Nico William failed to move to Barcelona or PSG. But no matter what, Nico's decision must have been very mature. Maybe the reason Barcelona or PSG's offer did not match his wishes could be one of the factors in Nico's failure to move. However, I heard news that Nico stated that he was very comfortable in Bilbao and he was sure that if he continued to stay in Bilbao he would be able to develop even better. Apart from that, according to news circulating, Nico also has an older brother who plays for Bilbao, this player is Inaki William. Maybe it was because of this factor that Nico decided to stay in Bilbao. Apart from that, at Bilbao, Nico currently earns a fairly high salary, so Nico certainly won't be in too much of a rush to move clubs. Apart from that, Nico is currently still very young so his career will definitely still be very long. So staying a year or three in Bilbao is definitely not a bad thing for Nico. Because if you think more deeply, if for example Nico moved to Barcelona, I would doubt Barcelona a little, because as we know, Barcelona's financial condition is currently not good. So if you look at all these factors, it makes sense that Nico chose to stay at Bilbao.