Ours were cut off at 7pm because that was when we ate dinner so no phones at the table. Then after dinner we would sit and chat and watch a tv show together. They still had a slot for tech from about 8.30pm.
They had been home since 3.30pm, got changed, had a snack and had done their homework and if there was no homework there was still no tech until a particular time. They could watch Youtube but it had to be a widening of their knowledge on whatever they were studying in school. The scope for this is huge.
Then they were on tech so that was at least an hour, then helping with dinner prep, setting the table and just being in the kitchen as a family listening to music or a podcast.
There needs to be balance, it cannot be all gaming and I say this as a parent of two sons who played eSports for their uni. They still had a sport 2 nights a week and we went swimming on the weekend as a family. Of course you are the worst parent because you love him so much you are willing to put boundaries in place.
My reaction to him saying he would quit all his clubs would be to tell him this is called a tall tantrum, it is the same tantrum a toddler throws when they too don't get their own way. Tell him you love him enough that you are willing to not have him like you but you will not be spoken to that way. Also tell him this is an immature attitude and if he wanted to ever get you to consider thinking of increasing his tech time then this is not the way to go about it.
Give him some space to think about his behaviour and say you can revisit the conversation about screen time in <give timeframe>. We did allow ours more tech as time went on because their attitude was great, came off no arguments (because they lost tech in the past for that) they were helpful, unpacking shopping, doing chores on their chore chart without comment. And most importantly their school work was done to a high standard both in class and their homework too. Plus they negotiated for it. We had family table talks, they feel heard, we didn't have to give an answer immediately. We could reconvene in a hour or whatever giving Dh and I a chance to talk. They need to feel like they have agency in their life.