Draw 10A from a 18650 Li-Ion battery safely
If you want an easy solution, you can stop with your fuses and just put on a 1s BMS unit. Just get one that will protect against over and under voltage conditions, and short circuit conditions. 

If you already knew that and you are asking because you want to build your own sort of BMS, then to answer your question: How to protect against under voltage, you would put a switch (a relay or equivalent) that can pass your discharge current in the discharge line. Monitoring the voltage of the cells and switching the switch when they go too low. Unless you are doing this just for a bit of fun though, then there is no need as these circuits are common already.