So i wanted to see for myself a broader picture of the draws since 2017, just to see if i notice any trends:
And basically the trend (blue line) is pretty flat since Jan 2017. The high and low spikes are associated with "unusual" invitations, which were either invitations with very low scores or very high ones. Usually they were in the range of less than 500 invitations, so overall they do not play a major role.
Average score since Jan 2017: 438
Average 2017 score: 431
Average 2018 score: 442
Average 2019 score: 449 (clearly misrepresented since we do no have full 2019 data)
Number of draws 2017: 31
Number of draws 2018: 27
Average draws per month: 2.21
This of course does not count in other factors, but based on this alone, those with 440+ points probably have a good chance in 2019.