How to make a mana bar system. REMADE(MINECRAFT)(BEDROCK)

Today I will show you how to make a mana system in Minecraft.
COMMANDS:
/scoreboard objectives add Mana dummy
/scoreboard players set @a Mana 0
/tickingarea add circle ~ ~ ~ 4
/scoreboard players add @a Mana 1
/execute as @a[scores={Mana=-1}] run scoreboard players remove @s Mana -1
/execute as @a[scores={Mana=21}] run scoreboard players set @s Mana 20
/title @p [scores={Mana=0}] actionbar §7§l-§f[][][][][][][][][][][][][][][][][][][][][]§7-
/title @p[scores={Mana=1}] actionbar §7§l-§b[]§f[][][][][][][][][][][][][][][][][][][][]§7-
/title @p[scores={Mana=2}] actionbar §7§l-§b[][] §f[][][][][][][][][][][][][][][][][][][]§7-
Continue adding bars over until you reach 20
/execute at @e[name="§1O§2m§3e§4g§5a"] run scoreboard players test @p[r=3,scores={Mana=!0}] Mana 10 25
/execute at @e[name="§1O§2m§3e§4g§5a"] run scoreboard players remove @p[r=3,scores={Mana=!0}] Mana 10
/execute at @e[name="§1O§2m§3e§4g§5a"] run effect @p[r=3,scores={Mana=!0}] speed 10 10 true