"Refraining from going out too much isn't good either as it lowers your immune system."
"Staying indoors too much lowers your immune system too so, ~"
"Refraining from going out too much" 「外出を控えすぎる」
"~isn't good either" 「〜も良くない」
"as it lowers your immune system" 「免疫力が下がるので」"lowers" の代わりに "weakens" 「力を下がる」も使えます。"as it weakens your immune system."
- "Staying indoors too much lowers your immune system too so, ~"
"staying indoors too much" 「家に残りすぎる」
"lowers your immune system too so, ~" 「も免疫力が下がるので
オーストラリア 
