@Dimitrios Kanellopoulos - you’d asked to put issues with the altitude estimated through the route planner in another thread. I’m not sure of a good place to put this. So here it is.
Note: the original route was created in Strava, not the routeplanner, or in SA. The link to the GPX is pasted below, and was imported into the routeplanner, which shows there is 282 m of climbing, and 288m of descent. When run, the route had 748m of climbing and descent. This was also confirmed on my running partners watch, with about the same number - that watch was a Fenix 7. SA shows yet another number (also much lower than reality for climbing and descent).
https://api.sports-tracker.com/apiserver/v2/routes/export/pkyRczXf7CZovLMQ-M6vFD6-2j7VQuAHHxYizX7enzTydxD_7ePH6Lkoe0MJDGep?brand=SUUNTOAPP&format=gpx-route