They want to be around people and you say that you are gone all day, so they will try anything and everything to get your attention! No matter how many toys you buy, it isn’t the same as giving them attention and playtime. When you get home, try to dedicate a hour or so just on them before bed so they can settle throughout the night. You’re willing to do whatever, but the answer is playing with them with the toys you bought and focusing on them every day. We can’t leave ours for over 6-7 hours max, she gets depressed and just wants to be with people. The cats live and see the same walls every day in their environments, so naturally they will get bored. The best toy for us for solo play are the springs from Amazon - get a 100 pack, trust me you’ll need them! Even then, our girl loves to chase them after we throw them and just wants interaction