Most CRMs that feel broken are badly configured. That is good news, because configuration is cheap to fix compared to replacement. If your scores cluster in fields, reports, and automations, do the cleanup. Delete dead fields. Rebuild the workflows you turned off. Write down what each one does and why. You will feel like you bought new software.
Replacement becomes the better answer when the limits are structural. You need record types the platform will not model well. You need approval rules that depend on your own pricing logic. You need to run the same data through operations, billing, and field work without three exports. No amount of admin skill fixes that, because the shape of your business does not match the shape of the product.
Then do the arithmetic, honestly. Take your seat count and your real monthly price per seat, including the tier you had to upgrade to. Add the add ons. Add the integration platform that glues it to accounting. Add the hours your admin spends per month keeping it upright, priced at their loaded cost. Multiply by 36 months, because that is a realistic planning horizon for a renewal decision. A forty seat team on a mid tier plan with two add ons and ten admin hours a month lands at a number most owners have never actually written down. Compare that number to a system your company owns outright, with no per seat fee and no tier gates. Sometimes the subscription still wins. Often it does not, and the difference is not close.
Where a custom build is the wrong call
Custom is not the default answer, and I will not pretend otherwise. If your needs are genuinely standard contacts, deals, and email sequences, a mainstream CRM does that better than anything you would commission. Marketing automation with deliverability at scale, calendar sync with every mail provider, and mobile apps polished by a thousand engineers are not worth rebuilding.
There are other honest caveats. A custom system needs someone accountable for it after launch, whether that is your team or a maintenance arrangement. Migrating years of attachments and email history takes scripted extraction, not copy and paste, and some third party sync data simply does not come out cleanly. If your sales team lives inside a platform marketplace app that has no equivalent elsewhere, that is a real switching cost. And if your leadership cannot commit attention to discovery, a build will reproduce your current mess in a new colour.