Look at the profile. The gradient is spiky, between 0 and 20%, for example. This indicates the altitude needs to be smoothed.
there’s two sharp corner warnings. These are a big problem. Loop warnings can generally be ignored, but sharp corners are always a problem. If you look at the corners, they have relatively few points. They would be improved by having more points, and with the curve occurring smoother, in an arc.
one of the corners is a turnaround. GPXMagic (or processGPX if you’re more of a command line person) can add a turnaround loop there. RGT cannot handle abrupt 180’s.
Fortunately, you can fix at least the first two of these by loading the GPX into GPXMagic (google for URL), load the GPX, click “one-click fix”, then save the new GPX. The loop can also be added (I’m not sure if one-click fix will do it but one of the tabs does this). With more experience you can learn how to refine it more. One thing I like to do is switch to satellite view and make sure the MR tracks the real road. If it doesn’t, you can use “nudge” with “smooth transition” (set transition length) to adjust groups of points. Then do “one click fix” after to make sure there’s no ugliness.