Most of the moderators (especially gold & platinum) have achieved their status without doing it the "easiest" way. If you'd rather take the simplest & the easiest paths when completing a goal or attempting success, chances are that it's going to take much longer than it's worth (if it's even possible). This is especially relevant when speaking about moderatorship.
Moderatorship is a responsibility. Effective moderation is not as simple as most people might think. Therefore, by default, the path to moderatorship is also not a simple one.
If you're interested in becoming a moderator, search the Q&A forum for tips, etc. If I were to lend some advice, it'd be the following:
Don't make too much of an effort to become a moderator, as you may burn yourself out altogether. Over the years, through trial & error, the team has become fairly efficient in regards to the their judgment and recognition of worthy users via noting (unmentioned) key attributes, etc. Just be yourself. If it's meant to be, it will be.
A moderator is a person who moderates community content by doing things like removing spam posts, banning fake accounts or are negative in any other manner and helps others in their queries. One can become a moderator by being active in the Q/A section and reporting inappropriate content. Moderators are chosen by Sololearn's Developers team (As far as I know).
For more information ask any of the mods like Hatsy Rei, Dayve, Agus Mei etc.