sharepoint full trust solutions or Full trust solutions on sharepoint online

sharepoint full trust solutions or Full trust solutions on sharepoint online:

1. Full trust solutions are solutions that are developed using SharePoint server DLLs and deployed on a farm. 
2. These full trust solutions execute on the server. 
3. Currently Full Trust solutions are not supported on SharePoint online.

Migration Limitation:

1. SharePoint Online does not support full trust solutions.
2. These solutions cannot be migrated to SharePoint online using any migration tool. Even ShareGate does not support this

Alternate Solution:

1. As an alternate to migrate these Full Trust solutions a transformation can be planned wherein these solutions can be rebuilt using the latest Microsoft Microsoft 365technologies. 
2. Below alternate solutions must be evaluated carefully based on business requirements as most of these solutions follow Client Object Model
3. These solutions can be rebuilt with Add-ins, SPFx, Power Apps, Power Automate Flow, etc.
4. ▪ Custom web parts can be rebuilt using SPFx.
5. ▪ Event recievers can be rebuilt using Remote Event Receivers hosted in Azure.
6. ▪ There are ready to use SPFx webpart solutions are available in github.

I hope the above information will help you to resolve the issue, in case of any queries/questions regarding the above mentioned information then please let me know. I would be more than happy to help you as well as resolves your issues, Thank you.