20:09:20.509: Output 'simple_stream': Total frames output: 2756
20:09:20.509: Output 'simple_stream': Total drawn frames: 1658 (2916 attempted)
20:09:20.509: Output 'simple_stream': Number of lagged frames due to rendering lag/stalls: 1258 (43.1%)
20:09:20.510: Video stopped, number of skipped frames due to encoding lag: 469/2879 (16.3%)
Rendering lag means the GPU is overloaded, encoding lag means the CPU is overloaded. In your case, both are overloaded. GPU is worse, and that's because the GT1030 isn't a good enough GPU for OBS. OBS needs a middle-range GPU even for software encoding because it uses the GPU to speed up certain processes. The GT 1030 you use is too slow. You need to update to at least a GTX 1050.
Basically anything that starts with "GT" instead of "GTX" isn't good enough for OBS unless you downscale to something like 480p.