Your usage doesnt need that. Unless you have some sort of business or critical service theres no reason for you to have 3 lines. You already had one of the fastest types of connections.

Max why on earth do you do this, you know you can't afford it and youve got yourself in difficulties before with subscription costs. I can get FTTP but I'm still on FTTC due to budget. I dont subscribe to the likes of Sky or any streaming aside from the free one that comes with Prime. I do get PIP but it costs me far more in carer costs that I need personal care help as my mobility has further declined. I cant even drive or get out on a mobility scooter and no holidays. So Im totally housebound and it would be wonderful to get a fast connection and able to enjoy streaming content.... but no-one pays my rent and household repair bills.
If you are in cooling off period best do so now. I dont know a single who is going to be impressed by what youve done. You cannot compete with people that need them for their employment. I'm holding back, but
Three connections is downright stupidity.. we all know in a few months time you will change your mind because of cost and have to get out of contracts due to mental health caused by financial stress. Dont do this to yourself again. Its cyclic; so perhaps see your GP now. Sooner rather than later and before you get in too deep. Please just take a step back and appraise your needs and finances.