Depends on the volume. If it's decent I'd suggest Clay + Claygent with your preferred AI provider.

Cold email agency owner here - personalization is cool and all but relevancy still is key. Atm we send about 500k emails per month across all of our clients and the kind of personalization that mentions their education, recent linkedin posts etc will just get not only ignored but reported as spam which will burn your infrastructure. Try segmenting the audience into multiple segments that leverage different pain points, score each of the leads not only on the ICP lvl but also on the IBP lvl. Keep it under 60 words, no links, no harsh CTA's Plus if you're more advanced then look for relevant sales intent signals, I'm not sure what your offer is but send me a DM maybe I can point you in the right direction.