Question Is my 2400mhz ram limiting my Ryzen 7 1700 and bottlenecking it?

Ryzen 7-1700 officially supports up to 2667Mhz RAM.
You may be able to Overclock your existing kit however there is no guarantee.
The Gigabyte DS3H-B450 supports up to 3600Mhz so no problems there.

Overclocking your RAM will need upping DRAM voltage slightly and maybe looser timings so give it a try but be carefull.
Not a great deal of difference performance wise from 2667MHz and 3200MHz anyhow.
Best is to keep the system stable.