The word “Rest” is misunderstood by humans. The rest God took is not because He was tired. The Bible never says He was tired. There is a time for everything. A time to work, a time to play, etc.
God completely finished His work and it was time to sit back and look at all His works and the beauty in them, and how it’s all working together. He didn’t leave things half-built then continue them later, which is what tired people do. God only “rested” because He finished completing everything that was necessary for life on earth to be possible, he completed all the mechanics needed to house the rest of his creations that would come afterwards.
Much like when putting an aquarium together, there’s a building of the actual system. Glass containment, Rocks, sand, plumbing, water, bacteria, lighting, etc. Next comes filling that system with fish after you step back and look at how it’s all completed and ready (Rest). He was simply standing back and enjoying the work done so far, before the next steps begin. It never says He slept, which is what tiredness always leads to. He “rested”, he stopped his works and took a good look at them, He didn’t go to sleep.
There is a time for enjoying what you’ve created. Looking at it and enjoying the works of your hands. That’s what God was doing. If God truly had limits to His strength then He would’ve collapsed under the strain of watching over people and protecting them until now, that has never happened and never will because His power is unlimited. God’s focus is so unlimited that every atom is accounted for in His mind and how it will be used in the course of eternity.
When God gave His people the Ten Commandments and told them to rest on the sabbath, that rest was not for gaining back your energy, sleep is for that, although for creatures with limited power it does do that as well. He simply meant for that day to be a day of looking back on your works and enjoying what you’ve created so far. Humans were His next project, He had finished His first project (Creation of the Heaven and Earth and it’s mechanics). He didn’t change what He created so far after His rest, He began to add to it on the eighth day. Tired people stop a task halfway through and continue it after they have slept. God had completed the task of creation of heaven and earth. After stopping and enjoying what He has created so far and the completion of it, He ventured on the next task that was Humankind. He rested on the seventh day not because He was tired, but because He’s organized and does things properly. There is a point when doing things properly that you have to look at what you’ve created before going to the next step, that’s what He was doing.
The word “Rest” is easy to misunderstand. Ever hear the term, “give it a rest”? When someone tells you that, they don’t mean, “your tired, go to sleep”. They mean, “stop it, you tire me”. Maybe God rested so others could regain their strengths. Jesus was involved in creation as well as angelic creatures, no one can keep up with God. Even jews where told that resting involved their slaves/servants to rest as well. God didn’t let the Jews rest and have their underlings do work that day, He demanded that everything stops for that day.