There are also some threads where some generous members make the effort and review posts (edit: as SFR10 suggested) that you submit and then maybe give you merit if the post deserves it. As Merits are per se a highly subjective matter, don't be disappointed if your post doesn't get in right away. Some factors have to come together in order that you get Merit. The most important being that you create genuine content, that someone who values it - and who has (s)Merit - also reads it.

Here is a list:
Please be reasonable if you submit something, as it really costs a lot of time for those members to do what they are doing

• sMerit Post-Review created by Bill Gator
• TMAN's Level up challenge.-- UPDATED... created by TMAN
• 14 merit bonus for quality users [Jr to Sr. Member] created by actmyname
• Joe's Signatureless Challenge: Win $25 ($10 for 2nd) + 8 Merits every week! created by BTCforJoe
• Topic & Post Review (Specific Areas) - sMerit to give created by Bolt Brownie
• sMerit for art ! created by snipie
• [ANN] The Utmost Epic, Totally Tubular sMerit Giveaway ~ 170 sM Available created by Gleb Gamow
• Point me to undermerited posts created by Wusolini
• A simple bitcoin Q/A. Learn new and interesting stuff about bitcoin. created by pugman with participation of Bill Gator
• I've still got 80 sMerit to give away. created by Jet Cash

Another helpful tool is the Browser extension "Grammarly" it automatically checks texts you type for grammar and spelling, then it marks possible mistakes and offers solutions.
Here's the link to the chrome web store https://chrome.google.com/webstore/detail/grammarly-for-chrome/kbfnbcaeplbcioakkpcpgfkobkghlhen?hl=en
A post that is easy to read AND has value is more likely to get Merit