best way to get fast combat levels?

[iiChonk]

i just rejoined skyblock after about 6 months. i am early - mid game and currently have enchanted fierce young drag armor with an enchanted legendary aotd with 6 hot potato books applyied. i wanna go to the nether/crimson isle, but you need combat 21 - and i have 19 1/2. any ways to get fast combat lvls? ty for your time!

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