There will almost certainly be another Mentoring Program - historically, we used to run them every summer, so it may be some time to wait for that.
In the meantime, this is what I usually tell new members :
1) Study your replays, particularly losses, so that you can try to see where you went wrong
2) Watch games by top casters on Twitch channels, e.g. Helping Hans runs Mentor evenings every Tuesday;
many top casters will answer questions as they broadcast, and there are some in Twitch chat who know what they are talking about.
3) Watch games by top players in Observation mode ingame
4) Watch Youtube casts which are posted on here. Good casters often point out tricks and problems
5) Read and understand these:-
Beginners guides
6) Then read the Strategy guides and Strategy forums
7) Then read 'Ask the Strategist'
6) If you are stuck, post a replay of a loss, NOT a win, on Replay Reviews, and somebody will try to help you
gl hf