If you are looking for other sites that delegate hive power and small amounts of hive.
Check out the giftgiver.site If they have any available they give out delegations for ~ 7 days.

https://giftgiver.site/

They also have the faucet that will give you,
claim your free 0.003 HIVE and 0.002 Hive Power, each hour.
https://giftgiver.site/faucet

It seems that Splinterlands pulls back it's delegation of hive power 60 days after the account is opened.