Leveling options for an uneven concrete floor in basement?
Too long for a comment: 
I like to reduce high spots because I have found with moisture most self leveling compounds just don’t last , a 4” angle grinder is a handy home tool and can be used to cut a trench or with painstaking work grind it all down, inexpensive grinders start at ~30$ and pro versions can be close to 200 for a 4” , going up to a 9”angle grinder with a carbide surfacing blade/ bit will cost around 300 but can do a large amount in a short time this tool is used to cut the high spots down faster than masonry disks without dust. 
I use water so a GFCI protected receptacle or extension cord is a must with my setup if no water is used the blade or bit doesn’t last long this eliminates the need for a dust mask but a shop vac and a large rubber floor squeegee is helpful.