Literally, go with gravity. Rhythm and feeling music is gravity.
Sway to music. Waltzes work nicely. Notice there is an up then a suspension then a down before going up again.
Conduct in two. There is an up, suspension, down with gravity, suspension, up, suspension. Feel the gravity. You don't have to use any muscle to go down. That is where effortless playing and timing comes from.
Walk. Notice as your right foot slightly suspends in the air, the left foot pushes backward then your right foot comes down as your body is pushed forward from backward. Gravity.
Beats are in you and around you. They are the laws of physics. Every motion has an equal and opposite motion. Up defies gravity and down goes with it. The suspension is the turning point. Feeling life in and around you will make you a better pianist.
Go for a walk, swing your arms and hum a tune in two or four. You'll look stupid but that too is part of being a musician: not caring what people think and doing what is within you. I guarantee you will keep a tempo and feel the beat. Music is your birthright. You don't need to do anything to achieve it, just get out of its way.
Bob your head. Tap your foot. All movement has ups, suspensions and downs.
Once you obtain the basic skills of piano playing, quit trying to control it and just let it go. Once you give in to the laws of physics, once you give up control of the piano, you'll gain control of it.
I used to be a stem christie skier and skiing was taxing. Once I learned to unweigh myself and ski in parallel, skiing became effortless and giving up control of the mountain and gravity actually gave me more control. Before I couldn't ski in powder, now I can.
Much like playing from the flexor muscles, playing can be taxing but, if you let the weight of the arm or gravity depress a key and relax the flexor, playing becomes effortless.
Don't confuse uneven playing with entasis. Don't count, feel. You can't feel if you are trying to control it. Any time you use your brain power on something technical, that is less brain you allow to . . . go with gravity. You can't feel if you over think. You can't play if you don't dance. All movement is dance. That too is your birthright. Dance like no one is looking. We are looking, though. The camera on your computer is on . . .