This article will help on how to increase the REST query limit
Step-by-step guide
- Jira Administration - Add-ons - Xray -Miscellaneous
- Scroll down the page until you reach Xray REST API :
After that press Save
Link for related documentation
https://confluence.xpand-it.com/display/XRAY/Miscellaneous#Miscellaneous-XrayRESTAPI