@Tinieblas 22k emails is useful but only if they still remember your site. I’d first do a soft reactivation email, like “new rewards / bonus code inside” and clean out bounces + dead users, otherwise you’ll burn the list fast.
For monetizing, split India separate from US/DE because EPC will be totally different. US/Germany can take gaming subs, game keys, VPN, cloud gaming, hardware deals, maybe paid newsletter placements from small gaming sites. India prob better with CPA/app installs/surveys/reward style offers, but keep it tied to points/gift cards or they’ll ignore it.
Don’t blast random crypto/casino junk unless you want the list dead in 2 weeks. Better to send 1-2 decent offers per week and keep the main angle “earn/redeem more”, since that’s why they signed up in first place.