For starters Trump reversed the decades long policy of opposing settlers taking Palestinian land. He also put the embassy in Jerusalem inflaming the region. This is in addition to ripping up the Iran nuclear deal and killing one of their generals in an air strike.

So why hasn't Biden reversed any of those decisions?

Settlement escalation and settler terrorism has increased under Biden.

He also vastly increased the drone strike program Obama had and got rid of reporting requirements for it. Also decided to ban Muslims from entering the US. I can go on if you need me to do so.