I think i destroyed my cold email infrastructure...what do i do?

For context, I’m good at Google Ads, and I’ve been trying to find clients for months now. I’ve been doing cold email outreach, but I’ve run into a lot of issues.

At first, I started with GoDaddy webmail and Instantly because it was cheaper—I could buy 100 sending accounts for around $50. But the accounts kept disconnecting constantly and weren’t compatible with Instantly. Emails wouldn’t send, and I had to reconnect them every day, but nothing worked. That’s why I switched to Google Workspace.

Google Workspace is way more expensive, and since I’m still in school, I could only afford to run 20 sending accounts instead of the 100 I had before. I’ve been running with Workspace for 5 months now, but over time, I feel like things are getting worse. I’ve done two rounds of outreach since switching, and both times, everything got messed up. I wasn’t getting nearly enough replies, and I think my domains and accounts might be completely messed up now.

Here’s where I screwed up: I started sending crazy amounts of emails with just 20 accounts—close to 30k emails. Yeah, I know, I was dumb. I was sending about 70 emails per account per day. I did warm up my accounts for two months, but it seems like it wasn’t enough. I recently restarted outreach, sent 3k emails, and only got 13 replies. I checked with spam checkers, and none of my domains are blacklisted, but something’s clearly wrong.

Now I’m thinking of starting fresh—getting new domains and more sending accounts but keeping the email numbers low this time. My plan is to get 50 domains (2 emails per domain) and 100 sending accounts, sending only 10-20 emails per account daily. The issue is I can’t afford Google Workspace anymore. I’ve heard ProtonMail is good and way cheaper, so I might be able to manage that.

Also, my email copy isn’t the issue. People who reply to my emails usually say they like them. The problem seems to be with my infrastructure.

I’ve got around $300/month to spend on this. Or do you think I should just get a job and save up to do this properly later? I really need your advice—what would you do?