Unfortunately, you should.
PCPartPicker Part List
CPU: Intel Core i5-8400 2.8 GHz 6-Core Processor ($199.89 @ OutletPC)
Motherboard: ASRock B360M-HDV Micro ATX LGA1151 Motherboard ($70.78 @ SuperBiiz)
Memory: Corsair Vengeance LPX 8 GB (2 x 4 GB) DDR4-3000 Memory ($44.99 @ Amazon)
Storage: ADATA SU800 128 GB M.2-2280 Solid State Drive ($32.03 @ Amazon)
Video Card: Gigabyte GeForce GTX 1050 2 GB D5 Video Card ($180.77 @ Amazon)
Case: Fractal Design Focus G ATX Mid Tower Case ($55.88 @ Amazon)
Power Supply: Cooler Master MasterWatt Lite Full Range 500 W 80+ Certified ATX Power Supply ($61.99 @ SuperBiiz)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($99.89 @ OutletPC)
Total: $746.22
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-10-02 12:13 EDT-0400
You can build it for $250 less. But that isn't the end of the story - a lot of these parts you don't
want at the prices you can buy these at. $200 for an 8400 is a poor bargain, a faster RX 570 can be had for a lot less than a GTX 1050, and the power supply is garbage at any price.
Something like this would be a better performer and safer than that $750 build.
PCPartPicker Part List
CPU: AMD Ryzen 5 2600 3.4 GHz 6-Core Processor ($129.20 @ OutletPC)
Motherboard: MSI B450M GAMING PLUS Micro ATX AM4 Motherboard ($99.89 @ OutletPC)
Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory ($69.99 @ Amazon)
Storage: Western Digital Blue 500 GB M.2-2280 Solid State Drive ($64.56 @ OutletPC)
Video Card: Gigabyte Radeon RX 570 4 GB Gaming 4G Video Card ($142.88 @ OutletPC)
Case: Fractal Design Focus G ATX Mid Tower Case ($55.88 @ Amazon)
Power Supply: Corsair CX (2017) 550 W 80+ Bronze Certified ATX Power Supply ($64.99 @ Amazon)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($99.89 @ OutletPC)
Total: $727.28
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-10-02 12:18 EDT-0400
This is about what a $1000 PC should look like. Now, people won't come up with the exact same $1000 system - people have different likes and make different choices - but this is in the neighborhood of what you ought to be expected at this dollar range.
PCPartPicker Part List
CPU: AMD Ryzen 5 3600 3.6 GHz 6-Core Processor ($194.79 @ OutletPC)
Motherboard: Asus PRIME X570-P ATX AM4 Motherboard ($159.99 @ Amazon)
Memory: Corsair Vengeance LPX 16 GB (2 x 8 GB) DDR4-3000 Memory ($69.99 @ Amazon)
Storage: Crucial MX500 1 TB M.2-2280 Solid State Drive ($107.89 @ OutletPC)
Video Card: Gigabyte GeForce GTX 1660 Ti 6 GB WINDFORCE OC Video Card ($269.99 @ Newegg)
Case: Fractal Design Focus G ATX Mid Tower Case ($55.88 @ Amazon)
Power Supply: Corsair TXM Gold 550 W 80+ Gold Certified Semi-modular ATX Power Supply ($69.99 @ Newegg)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($99.89 @ OutletPC)
Total: $1028.41
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-10-02 12:23 EDT-0400
The CPU is between 10-20% faster than yours in most scenarios and a 1660 Ti is more than twice as powerful as a non-TI 1050. A lot more storage, twice the RAM -- and I'm willing to bet faster RAM, though you did not specify -- better power supply, probably a higher-end motherboard.
If you can return, I'd strongly urge you do so.