Why

You told me one channel (email), one symptom (silence), and a volume between 50 and 200/month. That's enough volume to matter but the diagnosis you've written is the vaguest possible — "people don't respond" could mean cold outbound getting ignored, inbound inquiries going to spam, or your first reply taking three days. Each of those has a completely different fix, and none of them is a CRM. Until you know which one it is, buying software is lighting money on fire.

What you actually need

1. Google Postmaster Tools + Mail-Tester.com (free) — paste a sample of your outgoing email into mail-tester.com; it scores deliverability out of 10 and tells you if SPF, DKIM, and DMARC are broken. If you're under 8/10, your "no response" problem is that they never saw it.
2. A reply-time log in Google Sheets (free) — columns: Date received, Date first replied, Hours elapsed. Fill it in for the last 20 inquiries. If your median is over 4 hours, that's your answer, not the CRM.
3. A habit — the subject-line and first-line rewrite — pull your last 10 sent emails. If the subject line is generic ("Following up") or the first line is about you not them, rewrite them. Silence usually means the email got opened and closed in two seconds.

Do this today

Go to mail-tester.com, copy the unique address it shows you, and send a real inquiry-style email to it from your normal account. Click "Then check your score" and read the report. In 10 minutes you'll know if your "no response" problem is actually a spam-folder problem — which costs nothing to fix and no CRM in the world would have told you.

What to ignore

Skip HubSpot Sales Hub, Apollo, Outreach, Salesloft, and anyone pitching you "AI email sequencing" — they all assume your emails are landing and being read, which is exactly what you haven't verified. Lemlist and Instantly will happily charge you $99/mo to send more of the emails that aren't working.

What doing nothing costs you

At the low end of your range (50/month) with the silence you're describing, you're effectively converting near zero — every month you don't diagnose whether it's deliverability, speed, or copy, you burn another 50–200 inquiries you already paid to generate.

Where this leaves you

You've got a three-test diagnostic: deliverability score, reply-time median, and subject-line audit — in that order, because they cascade. The sequence matters: you own the mail-tester check today, the reply-time log by end of week, the copy rewrite next week, and the signal it worked is your first reply rate moving from "silence" to any measurable percentage at all. The slip is skipping step one because "our emails definitely send fine" — they often don't.

When to revisit this

When your reply rate is above 15% and the bottleneck becomes "too many replies to follow up on" instead of "no replies at all."