If you want your bike to look new and the protection to be invisible then fit invisikit.
If you think it’s expensive then fine, go and buy some sticky backed plastic, spend time with scissors and do a DIY job. You can do this quite cheaply and quickly, but it will look like a bodge. You can spend hours doing it and it will look like a bodge you spent time trying not to make it look like a bodge.
I have a 3yr old Capra that looks brand new and a 2yr old Jeffsy that looks brand new. You cannot see the invisikit. I rode 14,000 km last year, split between three bikes. No scuffs, scratches, dings or scrapes.
They are over £4k each, so the invisikit is peanuts. You can spend the same on a good tyre these days.