1. Paid Ads on Youtube
2. Paid Ads on Facebook (allowed now)
3. Reddit Organic Marketing
4. Emailing
5. Co-branding / Partnerships / Blogs / Youtubers
6. SEO
7. Growth Hacks
8. List your airdrop on airdrops.io or cocoricos.io
9. Get a bounty management system like bountyhunters.io
I think that some of these advertising campaigns are unlikely to suit the novice project, as they require payment in Fiat currency,and the budget of such an advertising campaign(YouTube,Facebook) is very large.