I highly doubt that the Abraham Accords will expand. The establishment at the State Dept. are fully in control now. The Abraham Accords broke all establishment thinking in creating peace in the Middle East. The biggest roadblock to the Abraham Accords was the State Dept., not Middle East nation states. Progress will not happen under Biden and I am willing to bet his administration will turn yet another Trump success to poo.
Formally joining the Abraham Accords isn’t so important. Israel has a bunch of security arrangements and trade deals, official and unofficial, with Arab countries because of fear of Iran and its proxies.
The weakness and attempting bullying of Israel by Bidenistas is even causing greater friendly Israeli interactions with Russia and China, India, and others.