If you’re self-hosting, your migration options are:
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Keep all the old comments in wordpress, turn on Discourse comments and use the wp-discourse plugin comment setting “Show Existing WP Comments”. This will let you show all the old Wordpress comments as well as new Discourse comments in the same comment section in Wordpress.
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Migrate all existing Wordpress comments to Discourse using a migration script. You’ll need to either be comfortable with handling code to do this yourself, or you’ll need to hire someone to help you.
If you’re not a developer and you’re looking for the simplest option, I would recommend you do “1”. On that, see further: