Get a proper router and don't torture your phone that way.
Everyday near 100GB, you will achieve 1TB in 10 days and your speed will be capped until your statement cycle refreshes.

Good luck to your phone. If I were you, I rather get a cheap Digi plan for my phone and let my Infinite 150 work at home with proper equipment.

Well, just saying. I have no issue because my main line is on Digi Ambassador 0 and sharing data with my Celcom corporate using my dual SIM phone and I also have a cheap Digi prepaid line for my iPad or spare phone.

Infinite 150 is in my router replacing UniFi 50Mbps at my home.

Using it myself and I cannot go more than 100GB per month and this month nearly approaching the amount because I uploaded 30GB+ photos to my Google Drive.

And yes, 5Mbps. Worth for it? Not sure. After all I hardly download anything these days unless software or Windows updates, fully streaming from my phone, laptop, iPad and Android box. No point keeping so much.

why not direct usb cable connect to computer usb tetthering

i dont think digi have any limited in hotspot tethering in digi infinite 150 plan,.. i have more than 5 device for sure,.. which phoen u are using as hotspot ? probably the device hotspot having issue to handling 5 device hotspot traffic load or your connection is having issue ?