I would recommend next steps for marketing  of Sigil:

1. Contact owner of  https://www.crypto-coinz.net/crypto-calculator/ by PM https://bitcointalk.org/index.php?action=profile;u=1042400 and ask for listing Sigil in calculator (may be offer some reward for listing). Your coin not must to be most profitable in listing but everyone should to see that current difficulty very low. A lot of miners looking for low difficulty and not for profitability exactly on this moment.

2. Try to be listed on https://coinmarketcap.com/  - communicate with team etc

3. Listing on Cryptopia or another classic exchanges is very slow process - try unusual places - for example Qbic received listing on BTC Alpha https://coinmarketcap.com/currencies/qbic/#markets and 24h volume not bad.

Official pool is absolute garbage. This dev can't even keep a simple php script working correctly for more than a day which says a lot about this coin as well.