These are some new websites I found that have infinite numbers of indicators if you are looking for new things to try. The forex indicators are suitable for algorithms of any kinds, take some time and check out each website.
MBAH ROSO; http://www.geocities.ws/m/b/mbahrosofx/
ABYSSE (From Japan in English);https://www.abysse.co.jp/mt4-e/indicator_name.html
Forex Indicator Library; https://www.forexmt4indicators.com/pt/category/forex-mt4-indicators/
Forex Station (Favorite Place); https://forex-station.com/viewtopic.php?f=578480&t=8430755
Earn Forex (High Quality Stuff); https://www.earnforex.com/metatrader-indicators/
MQL5 (Great Place); https://www.mql5.com/en/code/mt4/indicators