Help me choose ROM

Can you please advise what rom is currently good and efficient due to the battery. ???
Currently I have long been used ViperOne 9.0.0 ◦ Sense 7 + ElementalX-m7-20.2-Sense_kernel.
There is no more support. I would also try something new.
Mainly but- the battery is no longer in the best condition, so seeking economical rom.
Thanks for any advice.

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