The whole crypto market doesn't feel well these days, so it's not only about exchange platforms. All crypto projects lose users.
Still, if you have a viable product and a good offer you may still save your boat from drowning. Try the following:

1. Promote your platform on Quora, Reddit and all cryptocurrency-related forums in the relevant topics.
2. Find reputable services with crypto-oriented audience and contact them for cross-promotion.
3. Contact all the coins that are supported by your platforms and ask them to place the link to your platforms in the "exchanges" section.
4. If you already have some audience on social media, run a promo campaign. E.g. "No fees for 3 days for reposting our service on Facebook and Twitter". Duplicate this promo campaign via email marketing.
5. SEO is not dead either. A blog with many keyword-focused articles may attract more audience, but it will require lots of time and efforts. Wordpress+YoastSEO may facilitate the process.