To tickle your kid easily without having to bend down all the time, you can try snuggling in bed with them and then try tickling your kid with your foot.
Or even use a feather on a stick if you have one as feathers make good ticklers.
I remember when I was little, my dad would always come up behind me with a feather on a long stick, while he stood behind a doorway or he would be hiding behind a curtain and then tickle me with that feather.
I always loved it and he was such a great dad to me.
You could also sit down on the bed or couch with your kid and tickle them that way, without bending down.
Or while sitting on a couch, you could use your feet to tickle your kids tummy or their ribs as the kid walks by or lay on the floor.
You could even lightly shake your foot on your kids stomach, while your kid lies down, which is similar to that of a vibrating motion.
Or use the bucking bronco method for tickling your kid.
To use the bucking bronco tickling method for your kid, sit down and place your kid on your lap or your knees for a ride and then tickle your kid as they buck like a bronco.
My dad used to do that to me as well and it was really fun and I always looked forward to it.
You can also tickle your kid by using prop assisted tickling, the pretend step, or even an elevated tickle zone.
For the elevated tickle zone, have your kid lay on a sofa or bed, while you stand or sit comfortably, and place your kids stomach or armpits at your chest level.
For the pretend step method of tickling your kid, sit comfortably and then gently place one of your feet on your child's tummy, using your own toes to stimulate, without applying any weight.
And for the assisted prop tickling, you can use a toy, soft feather or a long scarf etc to reach your kid from a standing up or sitting position to tickle them.