Hi 147happy,
welcome to the Apple Community.
Apple support have an article that may help:
Import contacts from your SIM card to your iPhone
https://support.apple.com/en-us/HT202340
And
Here's a discussion thread about restoring iCloud contacts.
(Would you have made a back-up of the iPhone SE?)
https://discussions.apple.com/thread/253342078
Also:
About your eMail contacts,
(they may all be available from your eMail accounts):
Set up mail, contacts, and calendar accounts on iPhone
https://support.apple.com/en-au/guide/iphone/ipha0d932e96/ios
Hope this helps :-)