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Wow...I apologize you ran into this. There is a thread to report that problem: Report Devices Here With 18.06.0 Provided Image too big to save overlay
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Your device has 4 MB of flash, nothing is currently suggested for your device. See: https://openwrt.org/supported_devices/432_warning
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To be clear, "removing" a package from a pre-built firmware only marks the file as deleted, it actually creates more disk usage. You have to compile a custom firmware.
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I'm not even sure a tiny customized build would work. I actually have similar devices...I almost seemed like a troll when I asked about a similar upgrade:
It may be time to upgrade devices.