300k to invest, 38 m uk now or never

Good afternoon, I am 38 male uk. I have 300k wrapped in stock and shares isa but its just sitting there not invested. I have my own house paid for and will have another 200k to live on. I have been holding back for years incase I time it wrong, I feel its now or never. I have been looking at drip feeding maybe 20k a month into lifestrategy 100 and just leave it and see what it does. Is this good plan and is now bad time to do this? link comme

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