If you have partial genome data from 23andMe, Ancestry, etc, you can use what's called "genomic imputation" to do a sort of probabilistic gap-filling in your genome.
It's a bit tricky to do yourself, but there are paid services that will run the imputation for you and share the results.
I paid $15 for mine at https://dnagenics.com
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@codytruscott I signed up for that webinar, I hadn't heard of this tool before, thanks!
Got any other useful links/tools to share by chance?