Al-Andalus requires assistance from the greater Islamic world to outlast and survive the coming onslaught once Christendom recovers. This likely would not occur otl and likely cannot occur unless without crippling Europe outside of al-Andalus.
Reasons:
The tide of Umayyad invasion and Islamic dominance is bound to end at some point. Europe as a whole has much better resources than what can be mustered in the Khilafah and things are only looking down for Islam in terms of wars with Europe without major changes to the Abbasid.
Without the continued wave of Islamic attacks on France, the more populous and soon to be more productive Europeans will have ample time and resources to do what it did otl, completely route the Muslims in Spain.
As time progressed, Jihad and Ghazw became increasingly shifted in terms of its directions or completely abolished altogether as internal strife in the Mid East made it possible to do such expeditions closer to home. As well, the further intensified Khazar wars forced Muhjahid to fight in the Caucasian mountains and in the Pontic steppe. In both cases, the slave trade is of Armenians and the job of quelling their revolts was more profitable than to flock to the Pyrenees to fight the Franks. Further, the breaking of Zabul and Ghandhara during the Abbasid Caliphate allowed uninhibited invasions of Hindustan which brought immense wealth and thousands of slaves for the cities of Baghdad. Encouraged by the Ghaznavid capture and destruction of the Somnath Hindu temple and the public desecration of the idols from Somnath in Bagdad with the Caliph tearing apart the images, sent the Islamic world into a frenzy of conquest in India, at the expense of al-Andalus another area where jihad and ghazw was previously a favored occupation.
The beginnings of economic woes in the Abbasid period during the Samarra period made the religious sectarianism even more vicious; this led principly to the destruction of the Iraqi countryside of the Batihah Sawad. This was then followed by conquest by Turkish Mamluks and warriors and the creation of one of the worst possible things for al-Andalus, a large Shi'i Caliphate in the Fatimids, separating the Abbasid Caliph and the wider Sunni populace from what was the Taifa period Spain.
By this point, al-Andalus is lost in my opinion as Christendom is back on its feet and likely already was more populous and productive than the Islamic world and began recapturing the Mediterranean from the Muslim.
EDIT: I am further of the opinion that Berber warriors and the creation of states like Almoravids and Almohads are not enough. They in my opinion resembled say the Nicean Empire, a recovery without fully realizing the previous periods or the revived Abbasid power of al-Nasir prior to the Mongol conquest.