Like others recommend, I would hire a pro gutter team.
A skilled and knowledgeable pro team should show up with a man lift.

The 90 degree downspouts into shallow angle duct sections back to the house wall are probably the “root cause” of blockages.
45 and 22.5 degree turns are more clog proof.

Some leaf shapes go down gutters and downspouts relatively clog free.

Other leaf shapes, particularly Pin Oak with its needles, clog easily as do long needle Pine.

Examine the trees at the edge of the yard looking at leaf shapes.
Consider thinning out problem trees.