Here are several links to visual supports for prayers, high holidays and shabbat:
Here is a guide from Gateways on inclusive Shabbat worship
Matan offers PECS for High Holiday Prayers
Resources from Jewish Interactive on Jewish holidays, Hebrew instruction, secular Jewish and Israeli culture can be found here
RespectAbility offers several resources for High Holidays, the most recent is:
Opening All Gates: Making High Holiday Celebrations Accessible to All, In Person and Online, updated August 2021.
Please see their previous tool kit for other useful tips RespectAbility-Synagogue-High-Holiday-Toolkit for inclusive worship and also offers step by step instruction for worship organizations seeking to be more inclusive.
The Ruderman Foundation also catalogs several inclusion programs, including Gateways. Here is a link to Gateways High Holiday resources
From Longing to Belonging – Including People with Disabilities & Mental Health Conditions