xAutoDM

Cold outreach on X works, but only if you message people who can receive a DM and you send slowly enough that the account survives. xAutoDM handles both.
Connect your X account, then build a lead list by scraping the followers, verified followers, repliers, retweeters or @mentions of any profile, or by keyword — filtered down to people whose DMs are open. Write a message template with merge variables like {name}, {username}, {followers} and {bio}, add variants, and set a daily limit and a delay. The system drips the messages out, retries failures, respects a do-not-contact list, and stops a follow-up sequence the moment someone replies. Replies land in an inbox where you can answer or mark a lead as booked, and analytics show sent, failed and booked.
12 quick-start templates cover the common plays: DM new followers, DM a tweet's repliers or retweeters, DM by keyword, scrape a profile's followers, warm up then DM, follow-back cleanup, or upload your own leads.
Pricing is per connected X account, in four buckets: Solo 1 account at $29/mo, Growth 5 accounts at $125/mo, Scale 10 accounts at $199/mo, Agency 20 accounts at $299/mo. Yearly is ten months for twelve. A free Test plan gives you one account and enough credits to try it without a card. There is also a developer API at api.xautodm.com for teams that want to run outreach programmatically.